---
product_id: 499937086
title: "Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron"
brand: "wildbossy"
price: "€ 23.61"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.nl/products/499937086-cobalt-drill-bit-set-4mm-10pcs-m35-twist-drill-bits
store_origin: NL
region: Netherlands
---

# 10-Piece Set 5% Cobalt Alloy 67 Rockwell Hardness Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron

**Brand:** wildbossy
**Price:** € 23.61
**Availability:** ✅ In Stock

## Summary

> 🔧 Drill Like a Pro—Elevate Your Craftsmanship!

## Quick Answers

- **What is this?** Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron by wildbossy
- **How much does it cost?** € 23.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/499937086-cobalt-drill-bit-set-4mm-10pcs-m35-twist-drill-bits)

## 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

- • **Convenient Storage:** Comes in a sturdy case for easy transport and organization.
- • **Unmatched Durability:** Crafted from M35 Cobalt Steel, these bits outlast standard HSS by 17 times!
- • **Precision Engineering:** 140° split point design ensures accurate drilling without walking.
- • **Versatile Applications:** Perfect for hard metals, stainless steel, and more—your go-to for tough jobs.
- • **Satisfaction Guaranteed:** We stand behind our product—your satisfaction is our priority!

## 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 Rockwell hardness of 67, these bits are perfect for drilling through hard metals like stainless steel and cast iron. The set comes organized in a sturdy plastic case for easy transport, ensuring you have the right tools at your fingertips for any project.

## Description

Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm 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 17 times.
- ✅【10PCS METRIC DIRLL BITS SET】The set includes 10pcs of M35 4MM cobalt steel twist drill bits. Organized in a sturdy plastic storage case for easy transport to your workplace.
- ✅【TWIST DESIGN AND PERFORMANCE】Precise 140° 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 M40 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 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 1](https://m.media-amazon.com/images/I/61yinz9ELjL.jpg)
![Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 2](https://m.media-amazon.com/images/I/71qpwfnZwDL.jpg)
![Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 3](https://m.media-amazon.com/images/I/71NPSikdThL.jpg)
![Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 4](https://m.media-amazon.com/images/I/716R7l4nv6L.jpg)
![Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron - Image 5](https://m.media-amazon.com/images/I/81YrX0MJysL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    good drill bits, but....
  

*by G***E on Reviewed in the United States on September 13, 2023*

The drills are very good. Unfortunately, there were two drill bits missing from my set - 6.5mm and 8mm.Otherwise, good, sharp bits.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    I Got Them To Measure the Inside Diameter of Fuel and Vacuum Lines
  

*by A***R on Reviewed in the United States on September 16, 2023*

I suspect they're great for drilling but I needed to use them as "Pin" gauges.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Drill Bits
  

*by M***X on Reviewed in the United States on September 4, 2023*

As described

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-02*