--- product_id: 285838342 title: "M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal" brand: "stroton" price: "$33.37" currency: USD in_stock: true reviews_count: 8 category: "Stroton" url: https://www.desertcart.us/products/285838342-m42-8-cobalt-twist-drill-bits-12mm-x-2pcs-stainless store_origin: US region: United States of America --- # 3-step tip design for faster, precise drilling 68-70 HRC Rockwell Hardness for superior heat resistance M42 8% Cobalt Steel for ultimate durability M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal **Brand:** stroton **Price:** $33.37 **Availability:** ✅ In Stock ## Summary > ⚡ Drill Smarter, Not Harder — Own the Toughest Jobs with Ease! ## Quick Answers - **What is this?** M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal by stroton - **How much does it cost?** $33.37 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/285838342-m42-8-cobalt-twist-drill-bits-12mm-x-2pcs-stainless) ## 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 - • **Speed Meets Strength:** Run 3-5x faster drilling through stainless steel and hard metals without sacrificing tool life. - • **Unmatched Durability:** Crafted from premium M42 cobalt steel, these bits resist wear and heat like no other. - • **Versatile Powerhouse:** Perfect for stainless steel, hard metals, aluminum, plastic, and even hardwood—your all-in-one solution. - • **Cost-Effective Performance:** Higher upfront value means lowest cost per hole—drill more, replace less. - • **Precision Start Every Time:** Innovative 3-step split point tip eliminates walking and ensures immediate, clean penetration. ## Overview The M42 8% Cobalt Twist Drill Bits (12mm, 2-pack) deliver professional-grade performance with premium cobalt steel hardened to 68-70 HRC. Featuring a 3-step split point tip, these bits start drilling immediately with less force and run 3-5 times faster through stainless steel, hard metals, and more. Designed for longevity and precision, they offer the lowest cost per hole by maximizing tool life and minimizing wear, making them the go-to choice for demanding projects. ## Description Product Advantages: (1) 3 Steps desigh tip starts drilling immediately with less force and eliminates "walking" across the work surface. (2) Holds up better than generic high-speed steel,Cobalt gives high-speed steel more heat and wear resistance. (3) This drill bits set is made of Premium Cobalt (80,000 dollars per ton).(4) The M42 metric cobalt drill bits can cut through Stainless steel and Hard metal,Hard wood, although they can be used for softer materials such as Aluminum,Plastic. Some Important Tips about drilling stainless steel and hard metal: (1)Controling the drill speed from 200 to 1000 RPM would make it easier for you to drill holes on stainless steel. ________________________________ Stainless Steel ____________________________ Drill diameter RPM ____________________________ ≤5mm 1000~700 ____________________________ 5-10mm 700~350 ____________________________ 10-15mm 350~200 ________________________________ (2)Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating and forming a very hard oxide layer.It also works adding some vinegar,soy sauce or water if you don't have engine oil. Review: Good quality - Very good quality Review: Very good drill bits - Great drill bits. They cut through stainless steel very nicely if you take your time and use a cutting fluid to keep them cool. Had a minor issue with one of the bits snapping (my fault) but the seller took care of the issue immediately and was very responsive. ## Features - Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. - 3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic. - This Cobalt Drill Bit is Typically Capable of Running Three to Five 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 Throng the Material with a Blunt Drill Bit. - 2Pcs 135 Degree Split Point Drill Bits Includes :12mm(length:15.1cm)x2 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B081Z8GW47 | | ASIN | B081Z8GW47 | | Best Sellers Rank | #3,000 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Jobber Drill Bits | | Brand Name | STROTON | | Customer Reviews | 4.4 4.4 out of 5 stars (4,457) | | Customer reviews | 4.4 4.4 out of 5 stars (4,457) | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 12 Millimeters | | Date First Available | 13 January 2021 | | Finish Types | Hardened | | Is Discontinued By Manufacturer | No | | Item Weight | 454 g | | Item model number | M42 Cobalt-8 | | Manufacturer | WnewTools Ltd | | Manufacturer | WnewTools Ltd | | Material Type | Cobalt | | Model | M42 Cobalt-8 | | Number of Flutes | 2 | | Package Dimensions | 18.29 x 10.16 x 2.03 cm; 453.59 g | | Shank Type | Straight | | Surface Recommendation | Wood | | Tool Flute Type | Spiral | | UPC | 630808641305 | | Unit Count | 2 Count | ## Product Details - **Cutting angle string:** 135 Degrees - **Cutting diameter:** 12 Millimeters - **Finish type:** Hardened - **Material:** Cobalt - **Shank type:** Straight ## Images ![M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal - Image 1](https://m.media-amazon.com/images/I/51soMoU3ZcL.jpg) ![M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal - Image 2](https://m.media-amazon.com/images/I/61A9f7ng3vL.jpg) ![M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal - Image 3](https://m.media-amazon.com/images/I/51+LXKECrpL.jpg) ![M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal - Image 4](https://m.media-amazon.com/images/I/51Up-gxmVuL.jpg) ![M42 8％ Cobalt Twist Drill Bits (12mm x 2PCS) for Stainless Steel and Hard Metal - Image 5](https://m.media-amazon.com/images/I/615FtgwStIL.jpg) ## Available Options This product comes in different **Pattern** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality *by J***I on 20 December 2025* Very good quality ### ⭐⭐⭐⭐⭐ Very good drill bits *by B***E on 11 July 2025* Great drill bits. They cut through stainless steel very nicely if you take your time and use a cutting fluid to keep them cool. Had a minor issue with one of the bits snapping (my fault) but the seller took care of the issue immediately and was very responsive. ### ⭐⭐⭐⭐⭐ Very high quality drills *by C***S on 30 November 2023* I am a metal worker for 23 years, hard to find any better cobalt drills. Highly recommended. ## Frequently Bought Together - STROTON 12mm x 2pcs M42 8％ Cobalt Drill Bits for Stainless Steel and Hard Metal - Tap Magic 30004P ProTap Cutting Fluid, 4 oz. Size - Forney 20857 Tap Magic Industrial Pro Cutting Fluid, 4 oz --- ## 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.us/products/285838342-m42-8-cobalt-twist-drill-bits-12mm-x-2pcs-stainless](https://www.desertcart.us/products/285838342-m42-8-cobalt-twist-drill-bits-12mm-x-2pcs-stainless) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-04-26*