---
product_id: 206579455
title: "Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)"
brand: "stroton"
price: "¥19001"
currency: JPY
in_stock: true
reviews_count: 13
category: "Stroton"
url: https://www.desertcart.jp/products/206579455-metric-m42-8-cobalt-twist-drill-bits-set-for-stainless
store_origin: JP
region: Japan
---

# 19pcs, 1-10mm in 0.5mm increments - precision versatility 68-70 HRC Rockwell Hardness - extreme heat & wear resistance M42 8% Cobalt Steel - supreme durability Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)

**Brand:** stroton
**Price:** ¥19001
**Availability:** ✅ In Stock

## Summary

> 🔥 Drill Smarter, Last Longer — Own the Toughest Set in the Room!

## 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?** ¥19001 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/206579455-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

- • **Precision Range:** 19-piece set covers 1mm to 10mm in 0.5mm increments for exact sizing on every project.
- • **Effortless Cutting:** 135° split point design cuts cleanly, producing long iron chips instead of grinding, saving time and effort.
- • **Unmatched Durability:** Crafted from premium M42 8% cobalt steel for superior toughness and longevity.
- • **Heat & Wear Resistant:** 68-70 HRC hardness ensures faster drilling with minimal wear, even on stainless steel and hard metals.
- • **Trusted Customer Care:** Backed by stellar warranty and responsive support, ensuring your investment is protected.

## Overview

The Metric M42 8% Cobalt Twist Drill Bits Set features 19 precision bits ranging from 1mm to 10mm, engineered with premium cobalt steel and a 68-70 HRC rating for exceptional heat, wear, and chip resistance. Designed for rapid, clean drilling through stainless steel and hard metals, this set offers professional-grade durability and precision, supported by outstanding customer service and warranty coverage.

## Description

Premium M42 8% cobalt steel drill bits with 68-70 HRC deliver exceptional heat, wear, and chip resistance for faster, longer-lasting drilling through tough materials.

Review: Outstanding drill bits backed by exceptional customer service - 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.
Review: Sharp and fast bits - Had a box for over a year now. One use was on quite a few bits of steel from old power pylons, fairly sturdy stuff, hand held drill due to location. Another use has been on galvanized steel field gates, again hand held drill. Holes are made very quickly compared to other bits I've used, but I am an occasional driller rather than professional. They may be more brittle than standard HSS bits as we had a 6mm snap and a few larger bits chip at the ends. I think more careful use could have avoided this but that's hard to do with a hand held drill in some situations. I contacted the seller about the broken bits and within a few days I had a full replacement set! I am seriously impressed with their customer service and warranty.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 1,258 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 3 in Metalworking & Multi-Purpose Drill Bit Sets |
| Colour | Grey |
| Customer Reviews | 4.2 4.2 out of 5 stars (4,390) |
| Date First Available | 19 Jan. 2019 |
| Finish | Uncoated |
| Item Package Quantity | 1 |
| Item Weight | 454 g |
| Manufacturer | STROTON |
| Material | Cobalt |
| Measurement System | Metric |
| Number of Pieces | 19 |
| Package Dimensions | 17.6 x 12.5 x 4.4 cm; 453.59 g |
| Part number | M42 Cobalt-8(19pcs) |
| Pattern | 1-10mm (19PCS) |
| Size | 1-10mm (19PCS) |

## Product Details

- **Cutting angle string:** 90 Degrees
- **Cutting diameter:** 10 Millimetres
- **Finish type:** Uncoated
- **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)

## 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

### ⭐⭐⭐⭐⭐ Outstanding drill bits backed by exceptional customer service
*by P***L on 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.

### ⭐⭐⭐⭐⭐ Sharp and fast bits
*by T***W on 7 August 2024*

Had a box for over a year now. One use was on quite a few bits of steel from old power pylons, fairly sturdy stuff, hand held drill due to location. Another use has been on galvanized steel field gates, again hand held drill. Holes are made very quickly compared to other bits I've used, but I am an occasional driller rather than professional. They may be more brittle than standard HSS bits as we had a 6mm snap and a few larger bits chip at the ends. I think more careful use could have avoided this but that's hard to do with a hand held drill in some situations. I contacted the seller about the broken bits and within a few days I had a full replacement set! I am seriously impressed with their customer service and warranty.

### ⭐⭐⭐⭐ Decent Quality Bits At A Keen Price, Backed Up By Excellent Customer Service
*by M***N on 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 Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-07*