--- product_id: 430998172 title: "Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood" brand: "stroton" price: "249.15 DT" currency: TND in_stock: true reviews_count: 13 category: "Stroton" url: https://www.desertcart.tn/products/430998172-cobalt-drill-bit-set-1-16-1-2-inch-17pcs store_origin: TN region: Tunisia --- # 68 HRC hardness for superior heat resistance 2-3x faster drilling speed 5% Cobalt Steel for extreme durability Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood **Brand:** stroton **Price:** 249.15 DT **Availability:** ✅ In Stock ## Summary > ⚡ Drill like a pro, finish like a boss! ## Quick Answers - **What is this?** Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood by stroton - **How much does it cost?** 249.15 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/430998172-cobalt-drill-bit-set-1-16-1-2-inch-17pcs) ## Best For - stroton enthusiasts ## Why This Product - Trusted stroton brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Secure Storage:** Robust case with tight clamps keeps all 17 bits organized and ready for action. - • **Precision Engineered:** 135° split point design delivers clean, burr-free holes every time. - • **Unmatched Durability:** Premium M35 cobalt steel ensures long-lasting sharpness and wear resistance. - • **Versatile Performance:** Drills effortlessly through stainless steel, cast iron, wood, plastic, and more. - • **Speed Meets Efficiency:** Run 2-3 times faster than standard bits, reducing your project time significantly. ## Overview The STROTON Cobalt Drill Bit Set features 17 precision-engineered M35 high-speed steel bits with 5% cobalt, delivering exceptional hardness (68 HRC) and heat resistance. Designed for professional-grade drilling through tough materials like stainless steel, cast iron, and wood, this set offers 2-3x faster drilling speeds and long tool life. The included durable storage case ensures your bits stay secure and accessible, making it the ultimate upgrade for serious DIYers and pros alike. ## Description Product description STROTON 5% Cobalt M35 Drill Bits Set for Stainless Steel (1/16"-1/2",17PCS) Why choose STROTON cobalt drill bits? The research shows that HSS with M35 cobalt has a higher temperature resistance and Red hardness, a greater wear resistance(Hardness) and a higher heat treat response than HSS without cobalt . Red hardness, it causes the hardened steel to have an ability to maintain hardness at approximately 860-880 ℃ . 66-69 HRC,it means that the drill bits has 3X cutting ability and 3X durability. This drill bits set is made of Premium Cobalt (80,000 dollars per ton). Truly Made of 5% Cobalt Alloy Steel This drill bits set definitely have more cobalt in them than the "Cobalt" bits that HF sells--which are just Cobalt coated or only a tiny amount of cobalt tipped. Compared with ordinary high speed steel, 5% cobalt provides better heat and wear resistance,and Hold up Better. 3X Drilling Efficiency + 3X Tool Life Split Point desigh tip starts drilling immediately with less force and eliminates "walking" across the work surface. Ideal for Stainless steel,Hardened Steel,Cast Iron,Aluminum,Copper,Plastic and Hardwood. The drill bit can be used for mechanical maintenance, such as drilling out bolts and screws. Be vertical to the workpiece Non-vertical use may cause the drill bit to break. Using a drill press with sufficient power will make drilling easier. Keep low speed:200 to 1000 RPM Too high speed may burn the bit tip. Drill bits diameter： 1/16≤3/16，RPM（1000~700） 3/16-3/8， RPM（700~350） 3/8-1/2， RPM（350~200） Use cutting fluid to stay cool Add Cutting Fluid or engine oil to prevent the stainless steel from overheating. It also works adding some vinegar, soy sauce or water. Remain steady and patient The drilling shall be started slowly by applying force slowly and gently until the drill bit starts chipping. STROTON Ture Cobalt Steel Products for Stainless Steel, Hard Metal, and Wood. 1/16-1/2 Inch (17PCS) 1/16-1/4 Inch (13PCS) 4mm-32mm (15 Steps) 1mm-10mm (19PCS) Metric Drill Bits SAE Drill Bits Review: BEST I have ever owned (76-year-old woodworker) - This is by far, the very best and highest quality drill bit set I have ever owned. Unlike other bits I have encountered, these bits stay sharp and get the job done. They are ideal for drilling through steel and iron plates leaving sharp, clean holes every time. The warranty is also great - break a bit and they will replace it free of charge. Warranty card is inside drill box. While I'm praising the bits, let me also acknowledge that the drill bit storage box is really nice too. Yes, it's plastic, but the quality stands out from other brands as well. The bit clamps actually "hold" the bits tightly in place while stored, and the closure mechanism is top of the line too. I am NOT a paid reviewer or someone who got the product so I would review it. These are my actual assessments of this product. I just felt strongly enough about it to let others know what a great product it is and give STROTON their deserved credit. Review: Good kit. - These work very well for my purposes ## Features - Premium 5% Cobalt Steel ,68 HRC (Rockwell Hardness Scale) ,the Cobalt Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. - The Cutting Edge has been Ground Three Times and is made of Cobalt Steel, which has High Hardness and Heat Resistance. It is Designed for Drilling through Stainless Steel, Hardened Steel, Iron, Aluminum, Pipes, Wood, PVC, and Plastics. - This Heavy Duty Work Cobalt Drill Bit is Typically Capable of Running Two to Three Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes. - The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Through the Material with a Blunt Drill Bit. - 17Pcs 135 Degree Cobalt Industrial Hss Drill Bits Kit Includes :1/16 (2pcs), 5/64, 3/32 (2pcs), 7/64, 1/8 (2pcs), 9/64, 5/32, 3/16, 7/32, 1/4 (2pcs), 5/16, 3/8, 1/2 . ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09MRW8399 | | Best Sellers Rank | #174,107 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #368 in Jobber Drill Bits | | Brand | STROTON | | Brand Name | STROTON | | Customer Reviews | 4.5 out of 5 stars 545 Reviews | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 0.5 Inches | | Finish Type | Steel | | Finish Types | Steel | | Item Dimensions | 7.09 x 5.12 x 1.57 inches | | Manufacturer | STROTON Ltd | | Material | Cobalt | | Material Type | Cobalt | | Minimum Bore Diameter | 0.06 Inches | | Model | Cobalt 6 series bits inch 1/16-1/2 | | Number of Flutes | 2 | | Number of Pieces | 17 | | Part Number | Cobalt 6 series bits inch 1/16-1/2 | | Point Style | Split Point | | Set Name | 17-Piece Set | | Shank Type | 3-flats, Round | | Surface Recommendation | Cast Iron,Metal,Plastic,Stainless Steel,Steel,Wood | | Tool Flute Type | Straight | | UPC | 643459994935 | | Unit Count | 1.0 Count | ## Product Details - **Cutting Angle String:** 135 Degrees - **Cutting Diameter:** 0.5 Inches - **Finish Type:** Steel - **Material:** Cobalt - **Shank Type:** 3-flats,Round ## Images ![Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - Image 1](https://m.media-amazon.com/images/I/81nznZfGTrL.jpg) ![Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - Image 2](https://m.media-amazon.com/images/I/71XK-6BMgKL.jpg) ![Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - Image 3](https://m.media-amazon.com/images/I/71SicZwUs9L.jpg) ![Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - Image 4](https://m.media-amazon.com/images/I/71rPwB55ZzL.jpg) ![Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - Image 5](https://m.media-amazon.com/images/I/71Q-VSYomiL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Are these good for make holes in steel material?** A: Yes，good for drilling steel.Generally, sellers purchase products from the market and sell them on e-commerce platforms. The STROTON drill bits we sell are designed and produced by our factory, including the case, which is unique on the market. This drill bit contains 6% cobalt, which is higher than general products. In addition, STROTON hss drill bits have a secret heat treatment recipe.So They’re good at drilling steel. **Q: Where are these made?** A: They are made in China. They are very good cobalt drill bits set.It is designed and manufactured by STROTON, different from the similar products in the market. ## Customer Reviews ### ⭐⭐⭐⭐⭐ BEST I have ever owned (76-year-old woodworker) *by G***D on January 10, 2026* This is by far, the very best and highest quality drill bit set I have ever owned. Unlike other bits I have encountered, these bits stay sharp and get the job done. They are ideal for drilling through steel and iron plates leaving sharp, clean holes every time. The warranty is also great - break a bit and they will replace it free of charge. Warranty card is inside drill box. While I'm praising the bits, let me also acknowledge that the drill bit storage box is really nice too. Yes, it's plastic, but the quality stands out from other brands as well. The bit clamps actually "hold" the bits tightly in place while stored, and the closure mechanism is top of the line too. I am NOT a paid reviewer or someone who got the product so I would review it. These are my actual assessments of this product. I just felt strongly enough about it to let others know what a great product it is and give STROTON their deserved credit. ### ⭐⭐⭐⭐⭐ Good kit. *by P***A on May 1, 2026* These work very well for my purposes ### ⭐⭐⭐⭐⭐ Good bits *by D***. on February 12, 2026* These are good drill bits. So far I have drilled 8 half inch holes through 1/4” steel with it. It cuts good and has stayed sharp so far. ## Frequently Bought Together - STROTON Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - amoolo 3/8" Cobalt Drill Bit(5Pcs), M35 HSS Metal Drill Bit Set for Hard Metal, Stainless Steel, Cast Iron - BECOLLO 1/4 Inch Cobalt Drill Bit Set, M35 Jobber Length Twist Drill Bits,Suitable for Drilling in Hard Metal, Stainless Steel, Cast Iron,10 Pieces --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/430998172-cobalt-drill-bit-set-1-16-1-2-inch-17pcs](https://www.desertcart.tn/products/430998172-cobalt-drill-bit-set-1-16-1-2-inch-17pcs) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-06*