--- product_id: 442712405 title: "Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)" brand: "stroton" price: "฿13944" currency: THB in_stock: true reviews_count: 1 category: "Stroton" url: https://www.desertcart.co.th/products/442712405-metric-m42-8-cobalt-twist-drill-bits-set-for-stainless store_origin: TH region: Thailand --- # 3-5x faster drilling speed vs standard bits 68-70 HRC Rockwell Hardness for heat & wear resistance M42 8% Cobalt Steel for ultimate durability Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) **Brand:** stroton **Price:** ฿13944 **Availability:** ✅ In Stock ## Summary > ⚡ Drill Smarter, Last Longer – The Ultimate Cobalt Powerhouse ## Quick Answers - **What is this?** Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) by stroton - **How much does it cost?** ฿13944 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/442712405-metric-m42-8-cobalt-twist-drill-bits-set-for-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 - • **Premium M42 Cobalt Alloy:** Unmatched heat & wear resistance ensures long-lasting performance on stainless steel and hard metals - • **Optimized for Stainless Steel:** Ideal RPM guidelines and lubrication tips included for flawless, chip-free holes - • **Versatile 19-Piece Metric Set:** Covers 1mm to 10mm in 0.5mm increments for every professional project - • **Cost-Effective High-Speed Drilling:** Runs 3-5x faster, drastically lowering cost per hole despite premium quality - • **Precision Engineered 3-Step Split Point:** Starts drilling instantly with zero walking for flawless accuracy ## Overview The Metric M42 8% Cobalt Twist Drill Bits Set features 19 precision-engineered bits ranging from 1mm to 10mm, crafted from premium M42 cobalt steel with a 68-70 HRC rating. Designed with a 3-step split point tip, these bits deliver superior heat and wear resistance, enabling 3-5 times faster drilling through stainless steel, hard metals, and more. This set offers professional-grade durability and efficiency, making it the go-to choice for millennial managers demanding precision and longevity in their toolkit. ## 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: Best in high temperature work - Best performance drill bits ## 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 Design 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. - 19Pcs 135 Degree Split Point Drill Bits Includes :1mm(length:3.4cm) 1.5mm 2mm 2.5mm 3mm 3.5mm 4mm 4.5mm 5mm(length:8.5cm) 5.5mm 6mm(length:9cm) 6.5mm 7mm 7.5mm 8mm(length:11.5cm) 8.5mm 9mm 9.5mm 10mm(length:13cm) [DIA 0.5mm Increments] . ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07MZQMPMC | | Best Sellers Rank | #186,544 in Home Improvement ( See Top 100 in Home Improvement ) #1,443 in Drill Bit Sets | | Brand | STROTON | | Brand Name | STROTON | | Country of Origin | USA | | Customer Reviews | 4.4 out of 5 stars 4,387 Reviews | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 9.5 Millimetres | | Finish Type | Hardened | | Finish Types | Hardened | | Included Components | drill bits | | Item Weight | 1 Pounds | | Manufacturer | STROTON Ltd | | Material | Cobalt | | Material Type | Cobalt | | Minimum Bore Diameter | 1 Millimetres | | Number of Flutes | 1 | | Point Style | Split Point | | Shank Type | Straight | | Surface Recommendation | Metal, Plastic, Wood | | Tool Flute Type | twist | | UPC | 743829466298 | | Unit Count | 1.0 Count | ## Product Details - **Cutting Angle String:** 135 Degrees - **Cutting Diameter:** 9.5 Millimetres - **Finish Type:** Hardened - **Material:** Cobalt - **Shank Type:** Straight ## Images ![Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Image 1](https://m.media-amazon.com/images/I/71YyLQiGN8L.jpg) ![Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Image 2](https://m.media-amazon.com/images/I/61MlAqLl6WL.jpg) ![Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Image 3](https://m.media-amazon.com/images/I/51O0xcS5vrL.jpg) ![Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Image 4](https://m.media-amazon.com/images/I/51mSOKDFsAL.jpg) ![Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Image 5](https://m.media-amazon.com/images/I/51dgpHvzjSL.jpg) ## Available Options This product comes in different **Pattern** options. ## Questions & Answers **Q: Can these drill through a car's trunk without any issues?** A: These are made to drill through thick hard steel. Thus are very hard and brittle and will break easily if improper angle is applied. For drilling trunk or locks use a titanium bit and buy a few of them as they dull quick but get the job done. **Q: Bought the 19 pc set; 3mm but broke immediately. Can anyone point me to where I can buy replacement? Thank you.** A: Hi,I am the seller. You need to click the blue word [STROTON] in "Sold by STROTON and Fulfilled by Amazon" below the "Add to Cart" of this Drill bit's listing. Then click [Ask a question] that write the condtion simply to Establish contact channels with me through Amazon message system. Then I can handle the follow-up to your order. Best regards STROTON **Q: Can they drill titanium** A: Honestly,They are good for drilling steel and do the job well. But Titanium alloy has very high hardness. And We can't guarantee. If it doesn't work well, you could return it. If it works（Lubricant Must Be Used）, you could share it with other customers. **Q: What is the length of these bits?** A: They are average lengths. The 1mm is 3.4cm and length increase proportionally to the 10mm which is 5.4cm. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Best in high temperature work *by J***A on 6 April 2026* Best performance drill bits ## Frequently Bought Together - Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Tap Magic 30004P ProTap Cutting Fluid, 4 oz. Size - 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 --- ## 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.co.th/products/442712405-metric-m42-8-cobalt-twist-drill-bits-set-for-stainless](https://www.desertcart.co.th/products/442712405-metric-m42-8-cobalt-twist-drill-bits-set-for-stainless) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-29*