--- product_id: 256462160 title: "Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal(1.5mm-6.5mm/13pcs)" brand: "stroton" price: "R1361" currency: ZAR in_stock: true reviews_count: 13 url: https://www.desertcart.co.za/products/256462160-metric-m42-8-cobalt-twist-drill-bits-for-stainless-steel store_origin: ZA region: South Africa --- # Precision 13-Piece Set (1.5-6.5mm) - Versatile Sizes Heat Resistance up to 880°C - No Overheating 8% M42 Cobalt Steel - Ultimate Durability Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal(1.5mm-6.5mm/13pcs) **Brand:** stroton **Price:** R1361 **Availability:** ✅ In Stock ## Summary > ⚡ Drill Like a Pro, Last Like a Legend ## Quick Answers - **What is this?** Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal(1.5mm-6.5mm/13pcs) by stroton - **How much does it cost?** R1361 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/256462160-metric-m42-8-cobalt-twist-drill-bits-for-stainless-steel) ## 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 Efficiency:** Drill 3-5x faster than standard bits, reducing project time and cost per hole dramatically. - • **Versatile 13-Piece Metric Set:** From 1.5mm to 6.5mm, cover all your drilling needs across metals, hardwood, plastics, and aluminum. - • **Unmatched Heat & Wear Resistance:** Premium 8% cobalt M42 alloy keeps your bits sharp and cool under pressure, perfect for stainless steel and hard metals. - • **Precision Engineered 3-Step Design:** Split point and spiral flute ensure zero walking and clean, accurate holes every time. - • **Built for Professionals Who Demand More:** 68-70 HRC hardness rating means double the durability and triple the cutting power—invest once, drill forever. ## Overview The Metric M42 8% Cobalt Twist Drill Bit Set features 13 precision-engineered bits ranging from 1.5mm to 6.5mm, crafted from premium M42 cobalt steel for superior heat and wear resistance. Designed with a 3-step split point for accurate, chip-resistant drilling, these bits excel in stainless steel, hard metals, hardwood, aluminum, and plastics. With a hardness rating of 68-70 HRC, they deliver 3x cutting speed and 2x durability compared to standard HSS bits, making them the go-to choice for professionals seeking efficiency and longevity in demanding projects. ## Description The research shows that HSS with 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 ℃. Higher Tempering resistance,it means to maintain a high hardness at high temperatures for an extended period of time. 68-70 HRC,it means that the drill bits has 3X cutting ability and 2X durability. This drill bits set is made of (80,000 dollars per ton). This drill bits set is made of (80,000 dollars per ton). Holds up better than generic high-speed steel,8 gives high-speed steel more heat and wear resistance. starts drilling immediately with less force and eliminates "walking" across the work surface. Ideal for Stainless steel and Hardmetal,Hardwood,Aluminum,Copper,Plastic and Hardwood. Suitable for drilling Stainless Steel,Hard Metals,Aluminum,Copper,Plastic and Hardwood. The 3 steps design makes it accurately centered for woodworking jobs that require precision drilling. Also, the cobalt-containing design makes it perform even better in hardwood drilling. Non-vertical use may cause the drill bit to break. Using a drill press with sufficient power will make drilling easier. Do not use the drill bit on a percussion drill. This Drill bit can not be used on glass, walls and concrete. A high RPM improve drilling efficiency, but rather increases the heat between the bit and the workpiece, which may cause the bit to soften and the workpiece to harden. Drill diameter≤5mm，RPM（1000~700） 5-10mm，RPM（700~350） 10-15mm，RPM（350~200） 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. ## Features - Metric Cobalt 1.5mm-6.5mm Twist Drill Bits for Stainless Steel and Hard Metal,Hard Wood,Aluminum,Plastic. - Premium 8% Cobalt M42,Usually Give the Best Heat,Wear and Chip Resistance - 3 Steps Design for Cutting through Hard Metals and Stainless Steel. - 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. - 13pcs Include：1.5mm 2mm 2.5mm 3mm 3.2mm 3.5mm 4mm 4.5mm 4.8mm 5mm 5.5mm 6mm 6.5mm ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07MZQFD3S | | Best Sellers Rank | 65,604 in DIY & Tools (See Top 100 in DIY & Tools) 492 in Drill Bit Sets | | Brand | STROTON | | Customer Reviews | 4.3 4.3 out of 5 stars (4,701) 4.3 out of 5 stars | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 6.5 Millimetres | | Finish Types | Hardened | | Item Dimensions | 17.9 x 14.5 x 3.8 centimetres | | Item Weight | 1 Pounds | | Manufacturer | STROTON | | Manufacturer Part Number | G3-LIHI-G2BS | | Material | Cobalt | | Minimum Bore Diameter | 1.5 Millimetres | | Model Number | G3-LIHI-G2BS | | Number Of Flutes | 1 | | Number Of Pieces | 13 | | Point Style | Split Point | | Set Name | Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal (1.5mm-6.5mm/13pcs) | | Shank Type | Straight | | Surface Recommendation | Plastic | | Tool Flute Type | Spiral | | Unit Count | 13 count | | Upc | 743829466304 | ## Product Details - **Cutting angle string:** 135 Degrees - **Cutting diameter:** 6.5 Millimetres - **Finish type:** Hardened - **Material:** Cobalt - **Shank type:** Straight ## Images ![Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal(1.5mm-6.5mm/13pcs) - Image 1](https://m.media-amazon.com/images/I/61en4DHYxZL.jpg) ## Available Options This product comes in different **Size Name** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Outstanding drill bits backed by exceptional customer service *by on Reviewed in the United Kingdom 21 January 2026* These drill bits are genuinely very good quality and have performed extremely well for me when drilling into a wide range of materials, particularly metals (excluding concrete and masonry, as expected). They cut cleanly, feel well made, and have clearly been designed with durability in mind.During normal use, I unfortunately had two bits break. I contacted Stroton more to inform them than to complain, fully expecting at most a replacement for the damaged items. Instead, they responded quickly, asked no awkward questions, and simply requested confirmation of my address so they could send out replacements.To my surprise — and genuine appreciation — they sent out an entire new set, not just the broken pieces. This level of customer care is rare these days and speaks volumes about the company’s integrity and confidence in their products.Mistakes or failures can happen with any tool, but how a company responds is what really matters. Stroton handled this perfectly: polite, efficient, generous, and hassle-free. The replacement is already on its way, and I couldn’t be more impressed.Excellent drill bits, but even better customer service. I wouldn’t hesitate to buy from Stroton again and would happily recommend them to others. ### ⭐⭐⭐⭐⭐ Drill bit snapped on first use *by on Reviewed in the United Kingdom 30 July 2026* I purchased the cobolt drill bit set as i have dozens of drill bit sets but wanted a set of higher quality. As can be seen in the photo my cobolt set remains largely unused however, on using the 3.5 mm bit it snapped first use. I work private security overseas and so my time in the uk has been limited until now. It would be nice if Stroton were to honour their stated lifetime guarantee but am not holding out much hope but you never know. A good set of drill bits with the 3 step bit head design but very brittle. ### ⭐⭐⭐⭐ Decent Quality Bits At A Keen Price, Backed Up By Excellent Customer Service *by on Reviewed in the United Kingdom 3 March 2021* The item was sold at a keen price and delivered in double-quick time. I ordered the Cobalt drill bits because, having read the description, I believed they would be a more resilient bit than the normal HSS type, and would do the job of drilling out the sheared stub of a fixing bolt.However, I used two of the new bits to try and drill a pilot hole in the end of the stub and both of them very quickly blunted and lost their cutting edge, making no impression on the stub (I am unable to say what type of steel the sheared bolt stub was manufactured from).In view of this, and previously having blunted and broken several HSS bits, I was forced to abandon trying to remove the stub and used the Cobalt bits to drill a new hole through the 2mm steel sheeting which was easily achieved.And so, although the Cobalt bits didn't perform as I had hoped, they do appear to be quite a sturdy product and easily able to deal with cutting through reasonable thickness, normal steel, without a problem.As a result of the above, I contacted the seller to request replacement of the two damaged bits under the terms of their warranty. They not only responded immediately but did more than I anticipated, sending me a full new set of drill bits, as well as giving me a full refund on those initially purchased!What more could anyone ask for? If that's not excellent customer service, I don't know what is!! I recommend the company highly. ## Frequently Bought Together - Metric M42 8% Cobalt Twist Drill Bits for Stainless Steel and Hard Metal(1.5mm-6.5mm/13pcs) - 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.co.za/products/256462160-metric-m42-8-cobalt-twist-drill-bits-for-stainless-steel](https://www.desertcart.co.za/products/256462160-metric-m42-8-cobalt-twist-drill-bits-for-stainless-steel) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-09-14*