--- product_id: 573453375 title: "Cobalt Drill Bit Set 4.2mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4.2mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron" brand: "wildbossy" price: "Rp455357" currency: IDR in_stock: true url: https://www.desertcart.id/products/573453375-cobalt-drill-bit-set-4-2mm-10pcs-m35-twist-drill store_origin: ID region: Indonesia --- # M35 Cobalt Steel 67 Rockwell Hardness 10pcs Set Cobalt Drill Bit Set 4.2mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4.2mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron **Brand:** wildbossy **Price:** Rp455357 **Availability:** ✅ In Stock ## Summary > 🔧 Drill Your Way to Perfection! ## Quick Answers - **What is this?** Cobalt Drill Bit Set 4.2mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4.2mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron by wildbossy - **How much does it cost?** Rp455357 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/573453375-cobalt-drill-bit-set-4-2mm-10pcs-m35-twist-drill) ## Best For - wildbossy enthusiasts ## Why This Product - Trusted wildbossy brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched Durability:** Crafted from M35 Cobalt Steel, these bits boast a remarkable 67 Rockwell hardness, ensuring they outlast standard HSS bits by 26 times. - • **Precision Engineering:** Designed with a 149° split point and gold oxide surface, these bits prevent walking and enhance chip removal for a smoother drilling experience. - • **Versatile Applications:** Perfect for drilling through tough materials like stainless steel, cast iron, and aluminum alloys, making them a must-have for any professional toolkit. - • **Convenient Organization:** The set comes neatly organized in a sturdy plastic case, making it easy to transport and access your tools wherever your projects take you. - • **Satisfaction Guaranteed:** We prioritize your satisfaction; reach out to us for any concerns, and we’ll ensure you’re fully supported. ## Overview The Cobalt Drill Bit Set includes 10 high-speed steel drill bits made from M35 Cobalt Steel, designed for precision and durability. With a hardness rating of 67 Rockwell, these bits are ideal for drilling through hard metals and come organized in a portable case. ## Description Cobalt Drill Bit Set 4.2mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4.2mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron ## Features - ✅【5% COBALT TWIST DRILL BITS SET】Made from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 26 times. - ✅【10PCS METRIC DIRLL BITS SET】The set includes 10pcs of M35 4.2MM cobalt steel twist drill bits. Organized in a sturdy plastic storage case for easy transport to your workplace. - ✅【TWIST DESIGN AND PERFORMANCE】Precise 149° SPLIT Point, Gold Oxide Surface and Round Straight Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement. - ✅【VERSATILE USE】Our M49 Cobalt High-Speed Steel drill bits are ideal for cutting through hard materials like stainless steel, steel, and cast iron, as well as wood, aluminum alloys, and other metals. Please note that they are not suitable for glass or ceramic materials. Pay attention to speed, pressure, and heat control when drilling. - ✅【SATISFACTION GUARANTEED】We stand behind the quality of our product. If you have any problems or are not satisfied with our metric drill bit set, please feel free to contact WildBossy for assistance. ## Images ![Cobalt Drill Bit Set 4.2mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4.2mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 1](https://m.media-amazon.com/images/I/61osxgv3N-L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: I ordered this set but it came as a much cheaper set in a weak, brittle case. Is this what is being sent now, or was this just a shipping mistake?** A: Mine came in a clear plastic case with a black plastic divider section. Not the greatest however I needed the bits to work, not the case. **Q: I want to drill 8 to 10 holes through large, stainless steel hinges (3mm thick).Could I do the job with these drills?** A: Probably but you will need the right cutting fluid . I did not use this bits on SS yet. Thank you GOOGLE: "What can you use to cut stainless steel fluid? As a manufacturer of metal processing oil, we recommend MORESCO BS-6M soluble cutting fluid, MORESCO BS-9 soluble cutting oil. WILL CM-128 semi-synthetic cutting oil, WILL CH-370 semi-synthetic cutting fluid. These cutting oils are especially good on stainless steel, and provide excellent performances during machining." **Q: Is this suitable for the soft metal in jewelry?** A: yes, any metal **Q: Where are they made?** A: Unfortunately I could not find a country of manufacture this company. They are inexpensive bits, and I've had good luck with them. --- ## 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.id/products/573453375-cobalt-drill-bit-set-4-2mm-10pcs-m35-twist-drill](https://www.desertcart.id/products/573453375-cobalt-drill-bit-set-4-2mm-10pcs-m35-twist-drill) --- *Product available on Desertcart Indonesia* *Store origin: ID* *Last updated: 2026-05-13*