---
product_id: 766631610
title: "Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs)"
brand: "stroton"
price: "₨33738"
currency: LKR
in_stock: true
reviews_count: 5
category: "Stroton"
url: https://www.desertcart.lk/products/766631610-metric-m42-8-cobalt-twist-drill-bit-for-stainless-steel
store_origin: LK
region: Sri Lanka
---

# 3-5x faster drilling speed 68-70 HRC Rockwell Hardness - heat & abrasion resistant M42 8% Cobalt Steel - ultra durable Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs)

**Brand:** stroton
**Price:** ₨33738
**Availability:** ✅ In Stock

## Summary

> ⚡ Drill Like a Pro, Last Like a Legend

## Quick Answers

- **What is this?** Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) by stroton
- **How much does it cost?** ₨33738 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/766631610-metric-m42-8-cobalt-twist-drill-bit-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

- • **Precision 3-Step Tip:** Eliminates walking for pinpoint accuracy on stainless steel and hard metals.
- • **Speed Meets Endurance:** Drill 3-5 times faster without sacrificing bit longevity or sharpness.
- • **Versatile 19-Piece Set:** Metric sizes from 1mm to 10mm cover every professional drilling need.
- • **Premium M42 Cobalt Steel:** Engineered with 8% cobalt for unmatched heat and abrasion resistance.
- • **Optimized for Stainless Steel:** Use recommended RPM and tapping oil for flawless, chip-free holes.

## Overview

The Metric M42 8% Cobalt Twist Drill Bit Set features 19 precision-engineered bits (1mm-10mm) made from premium M42 cobalt steel with 68-70 HRC hardness. Designed for stainless steel and hard metals, these bits offer superior heat resistance, abrasion resistance, and chip control, enabling drilling speeds 3-5 times faster than standard bits. The 3-step split point tip ensures accurate starts and clean cuts, making this set a must-have for professionals demanding durability and performance.

## Description

Product Benefits: (1) The 3-step design tip starts drilling, eliminating "walking" across the work surface. (2)It has better resistance than common high speed steel, cobalt gives more heat resistance and abrasion resistance. (3) This drill bit set is made of premium cobalt ($80,000 per ton). (4) M42 Metric Cobalt Drill Bits can also be used for soft materials such as aluminum, plastic, but can cut stainless steel, hard metal, and hardwood. Important Tips for Drilling Stainless Steel and Hard Metals: (1) Control the drill speed from 200 to 1000 RPM, making drilling in the stainless steel easier. ________________________________ 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 to form a very hard oxidation layer. If there is no engine oil, you can also add vinegar, soy sauce and water.

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

## Features

- Premium M42 8% Cobalt Steel, 68-70 HRC (Rockwell hardness scale), usually provides the best heat, abrasion resistance, chip resistance, and long life
- 3 step design for cutting stainless steel, hard metal, aluminum and plastic
- This cobalt drill bit can run 3-5 times faster than usual. The price is expensive, but the cost of puncturing when using cobalt drill bits
- The bit edge is sharp enough to cut metal materials into long strips of iron chips instead of slowly grinding materials with dull drill bits
- 19 Pieces 135 Degree Split Point Drill Bits Contents: 1mm (Length: 3.4cm) 1.5mm 2mm 2.5mm 3mm 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: 10mm 0.5 inches (13 mm) DIA 0] in .5mm increments

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07MZQMPMC |
| Amazon Bestseller | #356,668 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #43 in Short Length Drill Bits |
| Batteries Included | No |
| Batteries Required? | No |
| Color | グレー |
| Customer Reviews | 4.4 4.4 out of 5 stars (3,702) |
| Date First Available | March 2, 2019 |
| Finish | Hardened |
| Included Components | Drill Bit |
| Is Discontinued By Manufacturer | No |
| 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 |

## Product Details

- **Cutting Angle String:** 90 Degrees
- **Cutting Diameter:** 1-10mm (DIA 0.5mm Increments) Millimeters
- **Finish Type:** Hardened
- **Material:** Cobalt
- **Shank Type:** Straight

## Images

![Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) - Image 1](https://m.media-amazon.com/images/I/71YyLQiGN8L.jpg)
![Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) - Image 2](https://m.media-amazon.com/images/I/61MlAqLl6WL.jpg)
![Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) - Image 3](https://m.media-amazon.com/images/I/51O0xcS5vrL.jpg)
![Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) - Image 4](https://m.media-amazon.com/images/I/51mSOKDFsAL.jpg)
![Metric M42 8% Cobalt Twist Drill Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs) - Image 5](https://m.media-amazon.com/images/I/51dgpHvzjSL.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

### ⭐⭐⭐⭐⭐ Review
*by A***R on March 13, 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.

### ⭐⭐⭐⭐⭐ Review
*by K***I on August 16, 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

### ⭐⭐⭐⭐⭐ Review
*by J***I on December 20, 2025*

Very good quality

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-05*