---
product_id: 442712405
title: "Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)"
brand: "stroton"
price: "HK$1665"
currency: HKD
in_stock: false
reviews_count: 5
category: "Stroton"
url: https://www.desertcart.hk/products/442712405-metric-m42-8-cobalt-twist-drill-bits-set-for-stainless
store_origin: HK
region: Hong Kong
---

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

**Brand:** stroton
**Price:** HK$1665
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Drill Like a Pro, Last Like a Legend

## 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?** HK$1665 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/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

- • **Unmatched Durability:** Premium M42 cobalt steel with 68-70 HRC hardness ensures long tool life and superior wear resistance even under intense heat.
- • **Versatile Size Range:** 19-piece set covers 1mm to 10mm in 0.5mm increments, perfect for everything from delicate plastics to tough stainless steel.
- • **Cost-Effective Performance:** Runs 3-5x faster than standard bits, drastically lowering cost per hole and boosting your productivity.
- • **Precision Engineered for Speed:** 3-step split point design eliminates walking and starts drilling instantly, saving you time on every project.
- • **Trusted by Pros & Backed by Service:** Highly rated with 4.4 stars and responsive customer support offering hassle-free replacements.

## Overview

The Metric M42 8% Cobalt Twist Drill Bits Set features 19 precision-engineered bits made from premium cobalt steel with a 68-70 HRC rating, delivering exceptional heat and wear resistance. Designed with a 3-step split point tip, these bits start drilling immediately with minimal walking, ideal for stainless steel, hard metals, plastics, and wood. The set covers diameters from 1mm to 10mm in 0.5mm increments, enabling versatile, high-speed drilling that lasts longer and costs less per hole. Trusted by professionals and backed by excellent customer service, this set is a must-have for any serious 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: Punte quasi perfette - Testate su acciaio da 5mm forando con la n.4 come pilota e sembra indistruttibile, le altre più grandi le usate solo per allargare il foro. La 4,5 usata come pilota si è spaccata al solo contatto con il pezzo, alcune si sono scheggiate lateralmente, probabilmente difetti di fabbricazione. Ho contattato il fornitore che mi ha subito inviato le punte in sostituzione, solo per questo meriterebbe 10 stelle. Provate su barra in ferro da 5mm e forano come se fosse burro. Consiglio pienamente l'acquisto.
Review: Excellent drill bits with an awesome warranty!! - I purchased these bits sometime ok...They are very sharp and cut into any material with ease and some cutting fluid of course!! However I did break a few on a project and dulled 4 bits...I contacted costumer service and within a few days they sent me a complete replacement with no questions asked.... Best companies costumer service I dealt with in forever!! Awesomeness!!

## 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 | #117,234 in Home Improvement ( See Top 100 in Home Improvement ) #885 in Drill Bit Sets |
| Brand | STROTON |
| Brand Name | STROTON |
| Country of Origin | USA |
| Customer Reviews | 4.4 out of 5 stars 4,335 Reviews |
| Cutting Angle String | 135 Degrees |
| Cutting Diameter | 9.5 Millimetres |
| Finish Type | Hardened |
| Finish Types | Hardened |
| Included Components | drill bits |
| Item Weight | 454 g |
| 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

- **Material:** Cobalt
- **Cutting Diameter:** 9.5 Millimetres
- **Finish Type:** Hardened
- **Shank Type:** Straight
- **Cutting Angle String:** 135 Degrees

## 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/51O0xcS5vrL.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/51dgpHvzjSL.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/51mSOKDFsAL.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/61MlAqLl6WL.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/71VWf6drWlL.jpg)

## 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

### ⭐⭐⭐⭐⭐ Punte quasi perfette
*by A***R on 13 March 2024*

Testate su acciaio da 5mm forando con la n.4 come pilota e sembra indistruttibile, le altre più grandi le usate solo per allargare il foro. La 4,5 usata come pilota si è spaccata al solo contatto con il pezzo, alcune si sono scheggiate lateralmente, probabilmente difetti di fabbricazione. Ho contattato il fornitore che mi ha subito inviato le punte in sostituzione, solo per questo meriterebbe 10 stelle. Provate su barra in ferro da 5mm e forano come se fosse burro. Consiglio pienamente l'acquisto.

### ⭐⭐⭐⭐⭐ Excellent drill bits with an awesome warranty!!
*by P***H on 13 September 2024*

I purchased these bits sometime ok...They are very sharp and cut into any material with ease and some cutting fluid of course!! However I did break a few on a project and dulled 4 bits...I contacted costumer service and within a few days they sent me a complete replacement with no questions asked.... Best companies costumer service I dealt with in forever!! Awesomeness!!

### ⭐⭐⭐⭐⭐ Si duran
*by K***I on 16 August 2023*

Las compré para inoxidables y se soporta las cargas como todo con el uso prolongado van perdiendo filo pero dura bastante para su precio

## 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

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-08*