---
product_id: 145184278
title: "CO14B 14 pc. Cobalt M42 Drill Bit Set | M42 alloy with 8% cobalt, jobber-length drill bits for stainless steel, cast iron, titanium, plus aluminum"
brand: "bosch"
price: "₩132003"
currency: KRW
in_stock: true
reviews_count: 13
category: "Bosch"
url: https://www.desertcart.kr/products/145184278-co14b-14-pc-cobalt-m42-drill-bit-set-m42-alloy
store_origin: KR
region: South Korea
---

# High-heat resistance for tough jobs 8% cobalt alloy for 10x durability Thick web-helix design for stability CO14B 14 pc. Cobalt M42 Drill Bit Set | M42 alloy with 8% cobalt, jobber-length drill bits for stainless steel, cast iron, titanium, plus aluminum

**Brand:** bosch
**Price:** ₩132003
**Availability:** ✅ In Stock

## Summary

> ⚡ Drill Like a Pro, Last Like a Legend

## Quick Answers

- **What is this?** CO14B 14 pc. Cobalt M42 Drill Bit Set | M42 alloy with 8% cobalt, jobber-length drill bits for stainless steel, cast iron, titanium, plus aluminum by bosch
- **How much does it cost?** ₩132003 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/145184278-co14b-14-pc-cobalt-m42-drill-bit-set-m42-alloy)

## Best For

- bosch enthusiasts

## Why This Product

- Trusted bosch brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Secure Grip, No Slip:** Three-flat shank design locks firmly in drill chucks, eliminating slippage and boosting control on every job.
- • **Unmatched Durability:** 8% cobalt M42 alloy delivers 10x longer life than standard bits, built to outlast your toughest projects.
- • **Versatile Metal Mastery:** Perfect for stainless steel, cast iron, titanium, aluminum, and more—your all-in-one metal drilling solution.
- • **Heat-Resistant Precision:** Engineered to withstand extreme temperatures, ensuring consistent performance without dulling or warping.
- • **Stable & Accurate Drilling:** Thick web-helix and split point design provide superior stability and fast material removal for clean, precise holes.

## Overview

The Bosch CO14B 14-piece Cobalt M42 Drill Bit Set features premium 8% cobalt alloy bits engineered for 10x longer life and high-heat resistance. Designed with a thick web-helix and split point tips, these bits deliver stable, precise drilling across a wide range of metals including stainless steel, cast iron, and titanium. The three-flat shank ensures secure chuck grip, making this set a must-have for professionals and serious DIYers seeking durability and performance in one sleek package.

## Description

BOSCH Cobalt M42 metal drill bits are engineered with an upgraded M42 alloy containing 8% cobalt. These hard-core Cobalt bits deliver 10x life vs. Standard bits, are jobber length and withstand high-heat applications. Ideal for diy projects, maintenance and repair, and metalworking; these twist drill bits provide dependable performance for diyers tackling tasks around the home or garage. The thick web-helix design of metal drill bit set for steel delivers fast material removal and increased stability for precision drilling and metal drilling. Bits that are 1/8 in. and larger feature a split point; bits 3/16 in. and larger feature a three-flat shank, for better bit grip. Designed as part of the BOSCH tools collection, these Cobalt drill bits provide superior performance in stainless steel and can be used to drill cast iron, titanium and other hard or abrasive metals.

Review: Premium Drill Bit That Powers Through Metal Effortlessly - This BOSCH Cobalt M42 3/8" drill bit performs extremely well, especially on hard metals. It made drilling feel almost effortless. Fit: Fits securely in standard drill chucks thanks to the three-flat shank design, with no slipping during use. Size: The 3/8" size is accurate and consistent, making clean and precise holes in various materials. Ease of Use: Very easy to use. It stays stable while drilling and doesn’t require excessive force to cut through tough metal. Compatibility: Works well across a range of materials including stainless steel, cast iron, and aluminum without issue. Case: Packaging is simple and protective enough to keep the bit safe during storage and transport. Appearance: Clean, professional look with a solid cobalt finish that reflects its heavy-duty design. Overall, this drill bit performs like a high-quality tool should. It cut through hard metal almost like melted butter, making it a reliable choice for demanding drilling tasks.
Review: Amazing Bits! - I never knew the magic of cobalt drill bits until I needed to drill some mounting holes on a steel bench grinder stand. The top of the stand was 3/8 in steel plate and it probably took 20 minutes to get through it with a standard bit. I did some research and ordered these bits. I don't need 50 different sizes because I'm not drilling metal frequently. This Bosch set seemed to be one of the few affordable sets that included the 1/2-in size. Plus... All of the bits above 3/16 I have a three-sided flat grind for better chuck lock up. Used the 1/4 in bit for a pilot and then the half inch bit to drill the remaining three holes. Less than 1 minute per hole, including the pilot, using a bit of cutting oil. It really is like magic. I'll be testing these to drill out a broken bolt in my mower deck next. I will update this review if I experience any durability issues. UPDATE: That broken spindle bolt in my mower deck must be special. Using low speed, a lot of pressure, and cutting oil I made it about a quarter inch into the bolt before dulling the bit. Switched to another bit and made it a bit further before killing that one too. Even with a decent hole drilled in the bolt, my extractors won't grab the hard metal. I'm not going to deduct a star since I didn't expect these bits to be invincible but hope this helps someone determine if these will work for your use case.

## Features

- Enhanced M42 Alloy Material: These drill bits for metal contain an 8% cobalt alloy that delivers 10x life vs. Standard bits
- Cobalt M42 Drill Bit: Provides upgraded M42 cobalt drill bits, jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
- Surface-hardened Tip: The Cobalt drill bits for hardened steel penetrate tough, abrasive materials
- High-heat Resistant Bits: This drill bit set for metal withstands high-temperature applications for extended periods of time
- Thick Web-helix Design: The BOSCH drill bit set features a thick web-helix design that provides additional stability in tough applications
- Includes: A versatile drill bit for metal assortment featuring 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", and 1/2" sizes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Q9HNTBH |
| Best Sellers Rank | #1,854 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Jobber Drill Bits |
| Brand | Bosch |
| Brand Name | Bosch |
| Customer Reviews | 4.6 out of 5 stars 7,232 Reviews |
| Cutting Angle String | 135 degrees |
| Cutting Diameter | 0.5 inches |
| Finish Type | Titanium |
| Finish Types | Titanium |
| Global Trade Identification Number | 00000346594591 |
| Included Components | 14 Drill Bits; Case |
| Item Dimensions | 7.2 x 5.6 x 1.8 inches |
| Item Type Name | Bosch CO14B 14 pc. Cobalt M42 Drill Bit Set |
| Manufacturer | BOSCH |
| Material | Cobalt |
| Material Type | Cobalt |
| Minimum Bore Diameter | 0.06 inches |
| Model | CO14B |
| Number of Flutes | 3 |
| Number of Packs | 1 |
| Number of Pieces | 14 |
| Part Number | CO14B |
| Point Style | Split Point |
| Set Name | 14-Piece Cobalt M42 Metal Drill Bit Set |
| Shank Type | 3-Flat |
| Surface Recommendation | Cast Iron,Metal,Metals,Stainless Steel |
| Tool Flute Type | Spiral |
| UPC | 000346594591 |
| Unit Count | 14 Count |
| Warranty Description | Product Defects Only |

## Product Details

- **Cutting Angle String:** 135 degrees
- **Cutting Diameter:** 0.5 inches
- **Finish Type:** Titanium
- **Material:** Cobalt
- **Shank Type:** 3-Flat

## Images

![CO14B 14 pc. Cobalt M42 Drill Bit Set | M42 alloy with 8% cobalt, jobber-length drill bits for stainless steel, cast iron, titanium, plus aluminum - Image 1](https://m.media-amazon.com/images/I/510IVXUDjfL.jpg)

## Available Options

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

## Questions & Answers

**Q: Length of the bits for each diameter?**
A: "Hi there, please see the following model with diameter and length size of the bits that comes in CO14B;
CO2131 - 1/16"" - 1.875""
CO2132 -  5/64"" - 2.0""
CO2133 - 3/32"" - 2.5""
CO2134 - 7/64"" - 2.625""
CO2135 - 1/8"" - 2.75""
CO2136 - 9/64"" - 2.875""
CO2137 - 5/32"" - 3.125""
CO2139B - 3/16"" - 3.5""
CO4141 -  7/32"" - 3.75""
CO2145 - 1/4"" - 4.5""
CO2147 - 5/16""  - 4.5""
CO2151 - 3/8"" - 5.0""
CO2159  1/2"" - 6.0""
For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST."

**Q: Where is the 5/64" individual bit? (The only one I need to replace, of course!)**
A: You always have to order any single bit or bit replacement separately, unless you can convince the company otherwise.

**Q: Does Bosch make a metric set????**
A: This COB14B Drill bit set is at a standard or imperial measurement. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST.

**Q: Do either of the sets come with a bit holder? If not, what size bit holder would work?**
A: The CO14B set doesn't come with a bit holder. The bits will work with drills that caters straight shank bits and three-flat shank bits. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7AM-7PM CST.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Premium Drill Bit That Powers Through Metal Effortlessly
*by J***F on April 23, 2026*

This BOSCH Cobalt M42 3/8" drill bit performs extremely well, especially on hard metals. It made drilling feel almost effortless. Fit: Fits securely in standard drill chucks thanks to the three-flat shank design, with no slipping during use. Size: The 3/8" size is accurate and consistent, making clean and precise holes in various materials. Ease of Use: Very easy to use. It stays stable while drilling and doesn’t require excessive force to cut through tough metal. Compatibility: Works well across a range of materials including stainless steel, cast iron, and aluminum without issue. Case: Packaging is simple and protective enough to keep the bit safe during storage and transport. Appearance: Clean, professional look with a solid cobalt finish that reflects its heavy-duty design. Overall, this drill bit performs like a high-quality tool should. It cut through hard metal almost like melted butter, making it a reliable choice for demanding drilling tasks.

### ⭐⭐⭐⭐⭐ Amazing Bits!
*by M***S on June 1, 2024*

I never knew the magic of cobalt drill bits until I needed to drill some mounting holes on a steel bench grinder stand. The top of the stand was 3/8 in steel plate and it probably took 20 minutes to get through it with a standard bit. I did some research and ordered these bits. I don't need 50 different sizes because I'm not drilling metal frequently. This Bosch set seemed to be one of the few affordable sets that included the 1/2-in size. Plus... All of the bits above 3/16 I have a three-sided flat grind for better chuck lock up. Used the 1/4 in bit for a pilot and then the half inch bit to drill the remaining three holes. Less than 1 minute per hole, including the pilot, using a bit of cutting oil. It really is like magic. I'll be testing these to drill out a broken bolt in my mower deck next. I will update this review if I experience any durability issues. UPDATE: That broken spindle bolt in my mower deck must be special. Using low speed, a lot of pressure, and cutting oil I made it about a quarter inch into the bolt before dulling the bit. Switched to another bit and made it a bit further before killing that one too. Even with a decent hole drilled in the bolt, my extractors won't grab the hard metal. I'm not going to deduct a star since I didn't expect these bits to be invincible but hope this helps someone determine if these will work for your use case.

### ⭐⭐⭐⭐⭐ Razor sharp (as it should be), seems to hold edges well, and a decent price
*by O***9 on March 25, 2026*

Drilling wood is a lot easier on bits than drilling steel or cast iron, but working with hard woods (like bubinga, rock maple, and Brazilian rosewood) dulls them down pretty fast. I'd sharpened the 1/8" bit in my full bit-set so often that it was too short, so I needed another, and thought I'd get Bosch, I'd heard they're quality tools. I bought an extra for the small collection I keep in my drill/driver case, since I use the 1/8" bit more than any of the others. I just received the two Bosch bits last night, went out to finish a shelf project where I had to drill about 40 1/8" holes in rosewood, 1/2" deep. I put this bit in my drill press, and it went into that hardwood like it was butter, no tear-out around the holes, and it's still sharper than I can get on a Drill Dr. I can't say how long it'll stay sharp, but so far I'm impressed

## Frequently Bought Together

- BOSCH CO14B 14-Piece Assorted Set with Included Case - Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
- Tap Magic 30004P ProTap Cutting Fluid, 4 oz. Size
- Lubri-Cut Cutting Paste for Drilling Metal - 2 Oz Tub - Made in USA | Beeswax Oil for Metal | High Performance Tapping & Cutting Wax | Saw Blade Lubricant & Drill Fluid

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-08-27*