---
product_id: 49690440
title: "TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry"
brand: "ttp hard drill bits"
price: "$1453"
currency: MXN
in_stock: true
reviews_count: 8
url: https://www.desertcart.mx/products/49690440-ttp-hard-drills-4mm-drill-bit-pack-of-10-cobalt
store_origin: MX
region: Mexico
---

# TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry

**Brand:** ttp hard drill bits
**Price:** $1453
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry by ttp hard drill bits
- **How much does it cost?** $1453 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/49690440-ttp-hard-drills-4mm-drill-bit-pack-of-10-cobalt)

## Best For

- ttp hard drill bits enthusiasts

## Why This Product

- Trusted ttp hard drill bits brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry

## Features

- About this item     5% Cobalt allows for drilling of harder metals     Used by locksmiths, mechanics and diy enthusiasts     Tested for hardness to ensure consistent high performance     Effective at slower speed enables easy drilling of stainless steel     Money Back Guarantee gives peace of mind with every purchase    ›See more product details

## Images

![TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry - Image 1](https://m.media-amazon.com/images/I/41zC0kY2lxL.jpg)
![TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry - Image 2](https://m.media-amazon.com/images/I/41NQHXer4DL.jpg)
![TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry - Image 3](https://m.media-amazon.com/images/I/71D9wNdxauL.jpg)
![TTP HARD drills 4mm drill bit - Pack of 10 Cobalt metal drill bits for drilling hard steel, cast iron, sheet metal & stainless, hardened heavy duty twist drills, 5% cobalt M35 jobber wood masonry - Image 4](https://m.media-amazon.com/images/I/41eINVuNGuL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    picnic
  

*by P***L on Reviewed in the United Kingdom on 18 May 2020*

picnic comes from computer support - "problem in chair, not in computer"having struggled to remove some metal bolts and then struggled again to drill the bolts out, a little research led me to these drill bits.  All the reviews suggested that they are the best.but I was drilling away and making virtually no progress and thinking "this can't be right"I'm more used to drilling wood or brick - I don't usually work with metalso - back on line - - first lesson - my drill was spinning too quickly - just left on the faster of 2 settings - so I selected the slower speed - about 400rpm. - still nothing - I'd been brought up with "let the drill do the work" but some of the videos show pressure being applied.  so I lent into the drill a bit - and then - oh boy ladies and gentlemen we have swarf !so, after a frustrating couple of hours I had finally figured out how to use these and after that I drilled thru the bolt in a couple of minutes.  the others followed - using the same drill bit - not fast but these are stainless steel bolts I'm drilling thru.so - a first class product - just take a moment to figure out how to use them !

### ⭐⭐⭐⭐⭐ 







  
  
    Drilling hard metals and hardened bolts
  

*by A***R on Reviewed in the United Kingdom on 19 October 2020*

Bought these to drill out broken hardened screws that had completely defeated normal HSS drill bits.  With a slow drill speed, progress was immediate and multiple screws were drilled out with no perceptible deterioration in the performance of the bit.  If you need to drill hard metals these bits are a revelation.  I've since purchased smaller diameter bits for drilling lock wire holes in hardened bolts, which they have done with ease.  Good price for what these do.

### ⭐⭐⭐⭐⭐ 







  
  
    VERY tough!
  

*by R***R on Reviewed in the United Kingdom on 28 December 2020*

Had to drill out a few steel bolts that held bbq burners in place. Other drill bits (made from titanium!) literally snapped on contact. However, these TTP/Cobalt drills got the job done... Highly recommended... :-)

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**Shop now:** [https://www.desertcart.mx/products/49690440-ttp-hard-drills-4mm-drill-bit-pack-of-10-cobalt](https://www.desertcart.mx/products/49690440-ttp-hard-drills-4mm-drill-bit-pack-of-10-cobalt)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-02*