My Twitter: https://twitter.com/KirbyLumias, As an Amazon Associate we earn from qualifying purchases. One of the most important factors to consider is the coating of grooving bits. The Titanium Bit Set With HSS Coating is the best for those who want a slightly more affordable option. Perfectly packaged to avoid the risk of damage; Cobalt makes the harsh piercing as much as the quickest; It comes with a rubber lock to remain closed; Not all boring tools are with the pilot point; The clear lid allows users to notice the contents instantly; Clip latch ensures a secure closing for the bit set; Best for wood, plastic, and hard materials; Bits are easy to take out of the case but not easy to put back because it suddenly hits; The dirt easily gets stuck inside the case, slowly making it brittle. Regular piercers are not suitable for hard metals because they do not have the required properties. Buying a drill bit is usually a no-brainer exercise. Ensures Safe Transport: The case of the bits set is made from an industrial-grade ABS material, making transporting these easier and safer. Despite being made for general purposes, the Hiltex 10005 boasts a heat-treated carbon steel construction. Step 12 Remove excess lubricant Also, the best option is to make holes of different sizes simultaneously. Each piercer can work perfectly on soft surfaces and hard metals. It decreases the potential to break the piercers. We provide 30-day money back. When considering the best drill bits for hardened steel, it is important to consider the material the bit is meant to work with. But whatever you buy, you must consider the factors mentioned above. Provides DIYers More Precise Performance: Spiral flute type offers high performance to the user. People sometimes use it in contrast to the hex shank. Cobalt material and cobalt alloy finish bring excellent durability, which is truly unique. (2019, December 18). DIYers can easily remove these piercers from the chucks, and the required piercer can be installed quickly. Cobalt M42 Drill Bit Set. The consent submitted will only be used for data processing originating from this website. The M35 drill bit is especially suitable for cutting hard metals, such as stainless steel, cast iron, superalloys, titanium alloys, rigid plastics, and wood, It can also be used in soft materials, Characteristics: The metal drill bit is 135split point with a round straight shank, self-centering prevents walking, and makes drilling precise and faster. So users can use it in the same way even after heavy use and lengthy storage. Cobalt bits are said to be most suitable for hardened Steel because they are made strong enough to deal with hard metals easily. Meets Almost All Project Needs: With many piercers in one case, the solution for any project from small to large is here. Has High Corrosion Resistance: Bits have a design that minimizes wear and has high surface corrosion resistance. It comes with much more durability as compared to HSS. You can use titanium drill bits to drill metal. This finish is also excellent at resisting corrosion. Add To Cart. These are made of high-speed Steel with high surface hardness and corrosion resistance. Cobalt bits can also be used for drilling through stainless steel. [EXTRA CENTER PUNCH] A rugged case keeps all drill bits well organized. For drilling steel, plastic, wood and similar materials. Gold Oxide Finishes Prevents Wear Out: Gold oxide finish prevents the boring tools from wearing out, abrasion or erosion, and reactions. You can go through each step with some breaks. Discover more about the small businesses partnering with Amazon and Amazons commitment to empowering them. There is no reason to be optimistic about a drill piercer set that has received a high rating. If the cooling liquid is not used during drilling, bit melt is possible. M35 grade piercer contains 5% cobalt, while M42 contains 8% cobalt. Therefore the boring tools do not suffer any damage. Moreover, since it has 15 sizes of boring tools, DIYers can practice and start with one at their convenience. No Need Center Punch: No center punch is needed. This will allow you to drill through the metal without damaging it. It also comes with a drill holder for easier storage after using. Well organized in a plastic indexed storage case for easy transport to your worksite. Can enter into the most rigid materials without a pilot hole; Reduces clogging by producing small chips; Fit anywhere, like a coffee mug during travel. These drill bits are designed to prevent chipping in the hardened steel and to dissipate the heat that can build when working with this durable material. The spiral-flute design has tiny grooves for cutting hard metal that the parabolic does not. Compare. HIDOTOL Cobalt Drill Bit Set 29 PCS - M35 High Speed Steel Twist Jobber Drill Bits for Hardened Metal, Stainless Steel, Cast Iron, Plastic and Wood with Indexed Round Case,1/16"-1/2" by 1/64" THS. This is why its important to put in the necessary amount of effort and research when choosing a drill bit for hardened steel. Also, the design helps the pieces endure pressure. Provides Multi-Purpose Drilling: This bit set is suitable for multi-purpose gouging because its primary material is cobalt. You will see how easily Hardox 450 can be drilled using the correct speed, pressure and pleanty of libricant paste. 2021 Kirbyresearch.com. Instead, youll want to drill slowly. Moreover, according to a report in The Guardian(1), it has some health benefits for humans. 15Pcs Forstner Woodworking Drill Bits Set Boring Hole Saw Cutter Wood Tools. Titanium coated for longer life. It runs throughout the . NASA/ADS. It also removes debris so that it does not create friction with the beet. Picture. Why? This model from DEWALT gives you these features. Free shipping. ORGANIZED HOLDER: Set includes the drill bit holder with size index for easy storage and organizing. A study by Harvard University shows(6) that when grooving, be aware of the impact of drilling parameters. This causes the piercers to fail to meet the rigid surface perfectly. They are less brittle then carbide tools but more brittle then HSS and you may break them if you're not careful enough. Drilling through metal is a lot harder than drilling through wood, and you'll need a tougher drill bit. 1.1Hardened Steel 1.2Stainless Steel 2Drill Bit Types and Materials 2.1i) High Speed Steel (HSS) Drill Bits 2.2ii) Cobalt (HSCO) Drill Bits 2.3iii) Carbide (Carb) Drill Bits 2.4iv) Titanium Drill Bits 3Best Drill bits for Stainless Steel / Hardended Steel 4i) Best Cobalt Drill Bits for Stainless Steel This means that its important that the drill bit be resistant to corrosion and abrasion. Hex shank keeps it usable in both impact drivers and drills; It comes with a longer life, producing less friction; Impact modes provide a clean and fast cutting. Considering the material of grooving piercers should be the priority. This 29 PCS M35 twist drill bit set meets all your needs, Cobalt 5% HSS: High-Speed Steel M35(Cobalt 5%)cobalt drill bit set can effectively drill tough and high tensile materials. Industry grade 6542 high speed steel drill bit set, harder than 4241 HSS used in other similar drill bits set, Set Includes: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8, 25/64, 13/32, 27/64, 7/16, 29/64, 15/32, 31/64 and 1/2 inch bits; Comes in metal indexed storage case for easy storage. Now its time to detail the top 10 boring tools mentioned in the table above. Then know which reviews are most important. But its titanium coating is six times stronger, allowing it to work with it for a long time. It requires more time than the regular bits. Check Price. All Filters. Twist design for clear chips faster, Enhanced M35 Alloy Material: These drill bits contain 5% Cobalt alloy steel, which increases wear resistance and durability. However, black oxide slightly increases chip flow but reduces subsequent friction. Shop products from small business brands sold in Amazons store. Recommended For Use On aircraft metals chrome titanium inconel stainless steel Alloys Steel Low-Medium-High Carbon Steel Aluminum Copper Glass Plastics Composite Materials Cast Iron -- Our Carbide drills stay sharp many times longer than traditional steel bits making them ideal for the toughest of applications! Using drill . So hard metal with no coating or regular coating will not be easy to conduct. Tungsten Carbide bits are harder than high-speed Steel and can efficiently drill on tough metal surfaces. 1). Users need to do much research on the Nit style of piercers when they are purchasing one for hardened Steel. Then undoubtedly, the piercers of this material offer the user a money-saving option. With that said, weve decided to round up the 6 best drill bits for hardened steel, as well as tips on how to choose. If you want to complete your piercing operation with a quality product, you should choose this one. The coating on this is designed to last longer while providing the best design finish. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. Besides, cobalt steel can properly maintain hardness during grooving. Carbide Drill Bits for Hardened Steel Harder, stronger, and more wear resistant than carbide-tipped steel, solid-carbide bits maintain their sharp edges longer. Easy To Carry: The bits available in canvas packing. Get wide range of Wooden Drill bit and Drill Bit-Metal and Wood online at hardwarepasal. Take a look at the drill bit you've got now -- it probably tapers to a point, which is the sign that it's not right for steel. Therefore, before gouging hardened Steel, it is necessary to check the amount of Cobalt used. Now, were glad to tell you that these drill bits more than meet the said expectations. A straight shank is used with both router bits and drill bits. Also, I love watching horror genre movies. It holds its hardness in extreme high heat situations when drilling hard metal, heat-treated steel, and stainless steel. Similarly, both Carbide and HSS can deal well with hardened Steel. A lot of these guys are shocked that people work with steels at 60 RC. Carbide Drill Bit Name. MACXCOIP Cobalt Drill Bit Set, 115Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel, 29-Piece (3018002), Norseman Drill Bits 44170 Ultra Dex Type 240-UB 135 Degree Split Point Magnum Super Premium Jobber Drill Set (29 Piece), COMOWARE Cobalt Drill Bit Set- 21Pcs M35 High Speed Steel Twist Jobber Length for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic with Metal Indexed Storage Case, 1/16"-3/8", Drill America - KFD1008-SET 8 Piece Heavy Duty High Speed Steel Reduced Shank Drill Bit Set (9/16" - 1" x 16ths), KFD Series, Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case (1/16" - 1/2" X 64ths), DWDCO Series, JIUWU 13pcs Tungsten Steel Cemented Carbide Twist Drill Bits, Metal Drill YG Alloy Blade, for Stainless Steel Copper Aluminum Zinc Alloy, 3 4 5 6 7 8 9 10 11 12 13.5 14 15mm, DEWALT Titanium Nitride Coated Drill Bit Set, Pilot Point, 21-Piece (DW1361), GMTOOLS 29Pcs Cobalt Drill Bits Set, M35 High Speed Steel, 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood with Metal Indexed Storage Case 1/16"-1/2", Drill America - DMOD1/4 1/4" Solid Carbide Drill Bit, DMOD Series, BeHappy 29PCS Titanium Drill Bit Set, M2 Drill Bit Set, High Speed Steel Metal Drill Bit Set for Stainless Steel, Hardened Metal, Wood, Cast Iron, Plastic with Indexed Round Case, 1/16"-1/2" by 1/64", NordWolf 5-Piece M35 Cobalt Jobber Drill Bit Set for Stainless Steel & Hard Metals, Multi Points Drill Tip with 1/4" Hex Shank for Quick Chucks and Drives, SAE Sizes 3/16"-1/4"-5/16"-3/8"-1/2", YOUGFIN Drill Bit Set- 29Pcs High Speed Steel Twist Jobber Length for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic with Indexed Storage Case, 1/16"-1/2", BeHappy Cobalt Drill Bit Set 29PCS, M35 Drill Bit Set, High Speed Steel Twist Jobber Drill Bit Sets for Hardened Metal, Stainless Steel, Cast Iron, Wood with Index Storage Case, 1/16"-1/2" by 1/64". Shank is usually the end of the piercer attached to the chuck. It has several small and large steps to help make the desired hole. Users can easily treat wood, plastic, iron, or rigorous metal surfaces using any of the 7 options. Piercers made of Cobalt steel have high hardness properties that provide maximum heat resistance when working on rigid metal. Harder, stronger, and more wear resistant than carbide-tipped steel, solid-carbide bits maintain their sharp edges longer. Based on consideration of material, coating, shank design, nit style, etc., a user has to decide on the right one. Harder than the three aforementioned materials, working on metal surfaces can be quite a pain, and youll need nothing but the best drill bits for hardened steel. In this article, I will cover all the queries of new and old users as there are product reviews and buying guides. See More, 8 Best Rated Drill Bit For Drilling Out Broken Bolts, The 9 Best Drill Bits For Stainless Steel. Comparison Chart Of The Best Cobalt Drill Bits For Hardened Steel IRWIN Drill Bit Set, Cobalt Steel, 29-piece (3018002) IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel,. (2007). However, I will recommend the DEWALT Bit Set With Titanium Nitride Coating, as many users have expressed their satisfaction. This cobalt makes up part of the steel blend, so the hardness of the bit doesn't wear off with a coating (like titanium bits). Besides, cobalt bits are less susceptible than other drill piercers, which are not easily damaged even at high temperatures. Moreover, the piercers can maintain hardness even under high temperatures. Best Drill Bits For Metal, Stainless Steel and Hardened Steel. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials. Cobalt bits are designed to work perfectly on hard metals(5). Best for DIYers: This set is the best option for those who are not professional in using pierces. View on Amazon SCORE 8.6 AI Score This score ranges from 0 to 10. https://www.theguardian.com/global-development/2019/dec/18/how-the-race-for-cobalt-risks-turning-it-from-miracle-metal-to-deadly-chemical, (2) Home. It is an expensive set. So if you want an affordable option, pick one from the top brands that meet your budget. Suitable For Universal Use: Only a few bits are ideal for grooving many types of materials. First off, before you start drilling through the material, youll want to lubricate it first with a few drops of oil. The bits also have a parabolic flute design which increases the strength of the drill bit. Super Premium Black and Gold Oxide Hi-Molybdenum Steel Drill Bit Set, 29-Piece, grey, MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Storage Box, 1/16"-1/4", DEWALT Titanium Nitride Coated Drill Bit Set with Pilot Point, 29-Piece (DW1369), JEFE HEX 115PCS M35 HSS Twist Jobber Length Cobalt Drill Bit Set 1/16"-1/2", A-Z, 1-60 with Metal Storage Case, NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, Multi Points Drill Tip with 1/4" Hex Shank for Quick Chucks and Drives, SAE Sizes 3/32"-1/8"-3/16"-1/4"-5/16", Snap On Drill Bit Set THUNDERBIT, Cobalt, 135 Split Point, 21 Bits 1/16"-3/8". The Masterforce 1" cobalt M35 industrial grade high-speed drill bit lasts ten times longer and provides superior, specialized performance. As an added bonus, the drill bit set can be used for wood and plastic applications, making it the ideal solution for drilling needs, both in construction and for simple home fixes. Its pretty different from the other piercers. You should also use a slower drill speed when drilling through stainless steel. This type of piercer is ideal for wood, tile, or soft metals such as aluminum. I'm a Kirby Research author, with a passion for writing, I've researched and published many in-depth product research articles! For most purposes, 350 to 1,000 rpm is a good speed. These cutting tools last longer as the amount of brittleness is reduced. Best Quality:Drill America 29 Piece M35 Cobalt Drill Bit Set The 135-degree split point also makes sure that the drill doesnt move around while drilling, allowing for quick and precise cuts and holes on hardened metal as well as on plastic and even hardwood. Premium Bright Finish 2/Pack multi-purpose solid carbide drill bits provide better rigidity than high speed steel bits. Study on drilling-induced delamination of woven kenaf fiber reinforced epoxy composite using carbide drills. Requires Lowest Cost Per Hole Drilled: Cobalt bits are more expensive than other options. M42 contains 8% cobalt, while M35 contains 5% cobalt. These drill bits are also designed to start drill immediately on contact, so you wont have to apply as much pressure, and because of its non-spinning shank, you wont have to worry about the drill bit coming loose from the impact. 21 PIECES INCLUDED: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8". Parabolic spiral-flute can only perfectly pierce holes in plastics and soft metals such as aluminum. These cobalt drill bits use an alloy including 5%-8% cobalt. Retains their edge for a long time. You should also use a slower drill speed when drilling through stainless steel. Increases cutting speed to allow faster cutting; Provides sharp cuts in various materials; Suitable for both professional and amateur use; Ensures safety by preventing flying metal scarves; Creates the smoothest and most perfect holes. Additionally, the finish lubricates the bits during mechanical action. Therefore, nothing else can be imagined as an alternative to cutting hardened or thick metal. On the other hand, one should avoid uncoated piercers for hardened Steel as they are only suitable for cutting soft metals. MOST DURABLE . First, a hole must be center punched in the steel. This piercer set will cut with careless sharpness. Usually, manufacturers design these Cobalt drill bits to deal with harder metals. Address: 2955 East Hillcrest Drive, Thousand Oaks, CA 91362 USA Phone: 800-350-8665 Ext: 100 This will help to prevent the drill bit from overheating and damaging the metal. The BOSCH CO14B is built to last. These jobber self-centering drill bits have the rigidity and length for most applications of corded or cordless hand drills and drill presses. Kango 3/16" Long Imperial HSS Drill Bit (0) $10. Needy Bits Are Easily Identifiable: There are some labeled slots and an advanced holder. They require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications. On the other hand, piercers with a titanium coating are suitable for use on wood or soft metals. Not to mention, drilling wont be as noisy anymore because of the presence of the emery cloth. Our bits have been tested and certified for hardness. They offer different characteristics for both hard and soft cuts. Drilling through metal is a lot harder than drilling through wood, and you'll need a tougher drill bit. Made out of titanium, these drill bits last longer than typical black oxide drill bits and are much easier to use on tough surfaces, including hardened steel. It completes any heavy work perfectly. Best Benchtop Drill Presses For All Types Of Work. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product. This is to make sure that the drill bit doesnt penetrate through a harder material once youve finished drilling. If there are positive comments from most users, it is quality equipment. SET OF 13 COBALT DRILL BITS - In the following imperial sizes 1/4", 15/64", 7/32", 13/64", 3/16", 11/64", 5/32", 9/64", 1/8", 7/64", 3/32", 5/64", 1/16". Cobalt steel is one of the most commonly used grooving piercer materials. Price. Cobalt drill bits are HSS bits made of a steel alloy with up to 8% cobalt. As a result, it can cut through the hardest material at a fast speed. Step 11 Drill through the hardened steel using a more significant drill bit Repeat the stage with a drill bit of larger diameter for more efficiency. The reason why you oil the material is to reduce the amount of heat and friction, allowing the drill bit to retain its edge for much longer. The coating is also another essential consideration. Hardened Steel Drill Bits for sale | eBay Hardened Steel Drill Bits All Auction Buy It Now 406 Results Brand Country/Region of Manufacture Number of Items in Set Condition Price Buying Format All Filters 13Pc Cobalt Drill Bit Set Twist Jobber Length for Hardened Metal Stainless Steel (7) $13.95 DEWALT Bit Set With Titanium Nitride Coating, IRWIN Drill Cobalt Alloy Steel Fractional Bit Set, Drill America Cobalt Bit Set With Round Case, DEWALT Cobalt Alloy Drill Pilot Point Bit Set, HYCLAT Titanium Step Drill Bit with Aluminum Case, BOSCH Drill Bit Impact Tough Titanium Set, Proffi Twist Drill Bit with Split Point Set. As a result, we may earn an affiliate commission via the links on our site at no additional cost to you. Set is designed for drilling in tough, work hardened materials like alloy steels and stainless steel You undoubtedly know that the spiral flute design can penetrate hard surfaces. Milwaukee No.2 Philips 2in. In case you see smoke while drilling, pause the process so that the metal can cool. Drills even hardened steel. Kirby Research is supported by its audience. 99. Learn more. You . Hiltex 10005 Industrial Drill Bit Set All ranking arrangements are automatically AI-driven according to product buyer reviews. https://books.google.com.bd/books?id=lnN1rcr4unoC&pg=PA332&dq=M35+or+M42+cobalt+for+hardened+steel&hl=en&sa=X&ved=2ahUKEwj9hqb875b6AhV3RmwGHf-8AGAQ6AF6BAhgEAI#v=onepage&q=M35%20or%20M42%20cobalt%20for%20hardened%20steel&f=false, (4) Tong, C. (2019). (Image/Wayne Scraba) Here's a collection of the 1/8-inch drill bits I tried that didn't work. Drilling holes sounds simple enough and actually is. Although it is very hard, it is often brittle. (1) Watts, J. NO CENTER PUNCH NEEDED - The 135 Quick-Cut points are self-centering and penetrate quickly with . Previously, I called the DEWALT Bit Set With Titanium Nitride Coating the best for those who want my opinion as a reviewer. Yes, a cobalt bit can drill through hardened steel. It all depends on how youre going to use it and what youre going to use it for. Less expensive kits may not work on harder metals. Compared to HSS, it will undoubtedly be ahead in terms of durability. BeHappy Cobalt Drill Bit Set 29Pcs, M35 Drill Bit Sets, High Speed Steel Twist Drill Bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood, Plastic with Metal Storage Case, 1/16"-1/2" by 1/64", The 10 Best Fireplace Insert in December 2022, 12 Best Rated Tv Stand With Electric Fireplace 2022, Top 8 Electric Patio Heaters For Outdoor of December 2022, Top 30 Real Christmas Tree of December 2022, The 14 Best Christmas Presents For Wife in 2022, The 12 Best Christmas Presents For Dad in 2022, 13 Best Rated Ugly Christmas Sweaters 2022, 11 Best Rated Smelling Christmas Tree 2022, Chitubox print settings for Elegoo saturn - Kirby Research, Best settings for resin printing miniatures, Planning to Buy a Laptop? Top 10 Drill Bits For Hardened Steel of December 2022, DEWALT Titanium Nitride Coated Drill Bit Set, Pilot Point, 21-Piece (DW1361), Norseman Drill Bits 44170 Ultra Dex Type 240-UB 135 Degree Split Point Magnum Super Premium Jobber Drill Set (29 Piece), DEWALT Drill Bit Set, Titanium Nitride Coated, 14-Piece (DW1354) , Yellow, BOSCH CO14B 14 Pc. Ideal for drilling mild steel, aluminum, copper, soft alloy steel, wood, and plastic, [SIZE LIST] 14 different sizes including 16PCS 1/16", 16PCS 5/64", 15PCS 3/32", 10PCS 7/64", 10PCS 1/8", 8PCS 9/64", 8PCS 5/32", 3PCS 11/64", 3PCS 3/16", 2PCS 13/64", 2PCS 7/32", 2PCS 1/4", 2PCS 5/16", and 2PCS 3/8". Other picks are also good enough. Provides An Extended Tools Life: The presence of rigid material like Cobalt gives significantly extended life compared to other piercing tools. One can use 5 piercers to make about 50 different-sized holes. It can also work effectively on wood, plastic, and hardened Steel. Find My Store. Step bits are very popular with DIYers for gouging holes to the correct depth. Heavy Duty Case Keeps The Bits Safe: The case is strong enough to hold 250 kits nicely. Drill Router Bits 4pcs 90 Degree Drill Bits Equipment Hardened Steel Set. Because hardened steel is so much more durable, the drill bit used should be just as durable as well. The depth of the hole being drilled. Cast iron and other hard materials can be drilled with this set of drill bits) Editor's Choise: GMTOOLS 29Pcs Cobalt Drill Bits Set (Ideal for hardening metal, cast iron, stainless steel, plastic and wood. Metal indexed storage case. These piercers come in different-sized steps. However, if looking for a more heat-resistant option, M42 should be used. The components of a cobalt drill bit are majorly based on 5% to 8% cobalt which helps get the job done. A split point cobalt drill will cut up into the 40's, so it depends on the lawnmower blade, but it takes quite a bit of feed pressure to cut hard steel regardless of the cutter material. HIDOTOL Cobalt Drill Bit Set 29 PCS - M35 High Speed Steel Twist Jobber Drill Bits for Hardened Metal, Stainless Steel, Cast Iron, Plastic and Wood with Indexed Round Case,1/16"-1/2" by 1/64" THS. I love talking about woodwork tools and my reviews are mostly based on the experience I have from my work. For your sake, this article will present an in-depth review of the 10 best drill bits for hardened Steel. We provide 30-day money back and lifetime warranty. Watch videos of hardened metal being drilled with TTP HARD cobalt drill bits. Dewalt DW1177drill bit set has a 135-degree split point tip which reduces walking and slippage when you first start drilling as well as helps to drill well into the metal surface. 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