---
product_id: 564908951
title: "BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2)"
brand: "bosch"
price: "€ 16.69"
currency: EUR
in_stock: true
reviews_count: 11
category: "Bosch"
url: https://www.desertcart.fi/products/564908951-bosch-co2135b-1-8-in-x-2-3-4-in
store_origin: FI
region: Finland
---

# High-heat resistance for tough jobs 8% cobalt alloy for 10x lifespan Split point design for no-skid starts BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2)

**Brand:** bosch
**Price:** € 16.69
**Availability:** ✅ In Stock

## Summary

> 🔥 Drill Like a Pro, Last Like a Legend ⚙️

## Quick Answers

- **What is this?** BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) by bosch
- **How much does it cost?** € 16.69 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/564908951-bosch-co2135b-1-8-in-x-2-3-4-in)

## 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

- • **Effortless Precision:** Split point tips eliminate skating, delivering clean, accurate starts without the hassle of a center punch.
- • **Unmatched Durability:** Engineered with premium M42 cobalt alloy to outlast standard bits by 10x, keeping you ahead on every project.
- • **Versatile Metal Mastery:** Perfectly crafted for stainless steel, titanium, cast iron, aluminum, and more — your go-to bit for professional-grade results.
- • **Stability Meets Strength:** Thick web-helix design and heat-treated manufacturing provide superior stability and toughness for metal drilling.
- • **Heat-Resistant Performance:** Built to withstand extreme temperatures, ensuring consistent precision even under the most demanding conditions.

## Overview

The BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit pack of 2 features premium 8% cobalt alloy construction for 10x longer life, high-heat resistance for extended use, and a split point design for precise, no-skid starts. Engineered with a thick web-helix and surface-hardened tip, these bits excel in drilling stainless steel, titanium, cast iron, and aluminum, making them the ultimate choice for professionals demanding durability and precision.

## Description

BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - desertcart.com

Review: Best bits for drilling metal I have ever used - I bought the 14-piece cobalt set (upgrade over the Bosch titanium sets) almost two years ago (Jan 2024). I have been impressed enough with their performance to feel compelled to come back and review them, as well as buy a larger set (21-piece cobalt, which has a few sizes and duplicates that the 14-piece set doesn't include). In addition to occasional use of various sizes over the last two years on wood, PVC pipe, and aluminum, I used two of the bits in a single project to drill over a hundred holes in mild steel angle iron and rectangular tubing. I used a drill press, set up at a slower speed, along with plenty of cutting oil (sometimes reapplying midway through drilling a hole). In line with other bits I've used in the past, I expected the two bits I was repeatedly using to dull to the point of uselessness part-way through the project. Much to my surprise, both bits survived and still cut practically like they are new. Bottom line, if you are using these bits to drill into mild steel with a drill press set at a slower speed and generous application of cutting oil, these bits are a fantastic choice. I have also used these bits to drill into aluminum, PVC pipe, and woods of various hardnesses with absolutely no issues. Highly recommend any of the Bosch M42 cobalt bits.
Review: Great Quality - Great results in use. - High Quality - never had a cobalt set before but from using this set i've been highly impressed. These stay sharp longer and provide a better cut compared to standard high volume big-box store brands like Dewalt.

## Features

- The information below is per-pack only
- COBALT M42 DRILL BIT: Provides upgraded m42 cobalt jobber-length bits designed for durability, high heat resistance and hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
- ENHANCED M42 ALLOY MATERIAL: Contains 8% cobalt alloy that delivers 10x life vs. standard bits
- HIGH-HEAT RESISTANT BITS: Withstand high-temperature applications for extended periods of time
- THICK WEB-HELIX DESIGN: Provides additional stability in tough applications
- SURFACE-HARDENED TIP: Penetrates tough abrasive materials
- SPLIT POINTS ON BITS 1/8 IN. AND LARGER: Allow for easy starts with no skating, eliminating the need for a center punch
- HEAT-TREATED MANUFACTURING PROCESS: Helps to ensure the strength of bits

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CHMV3723 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #1,899 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Jobber Drill Bits |
| Brand | Bosch |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (6,839) |
| Cutting Diameter | 0.13 Inches |
| Date First Available | January 13, 2026 |
| Finish | Titanium |
| Finish Type | Titanium |
| Item Package Quantity | 1 |
| Item Weight | 1.28 ounces |
| Item dimensions L x W x H | 2.75 x 1.75 x 5.79 inches |
| Item model number | CO2135B |
| Manufacturer | BOSCH |
| Material | Cobalt |
| Number of Flutes | 3 |
| Number of Pieces | 2 |
| Part Number | CO2135B |
| Pattern | Solid |
| Point Style | Jobber Point |
| Product Dimensions | 2.75 x 1.75 x 5.79 inches |
| Set Name | 2 |
| Shank Type | Straight |
| Size | 1/8 x 2-3/4 in. (Pack of 2) |
| Style | Industrial |
| Surface Recommendation | Aluminum, Metal, Stainless Steel |
| Tool Flute Type | Spiral |
| Unit Count | 2.0 Count |

## Product Details

- **Brand:** Bosch
- **Cutting Diameter:** 0.13 Inches
- **Finish Type:** Titanium
- **Material:** Cobalt
- **Shank Type:** Straight

## Images

![BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - Image 1](https://m.media-amazon.com/images/I/21gwwsORZOL.jpg)
![BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - Image 2](https://m.media-amazon.com/images/I/41Xn8Z+58LL.jpg)
![BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - Image 3](https://m.media-amazon.com/images/I/41YGBOdmZ3L.jpg)
![BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - Image 4](https://m.media-amazon.com/images/I/41ZWa5wFVpL.jpg)
![BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2) - Image 5](https://m.media-amazon.com/images/I/41dsZ0AIAlL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best bits for drilling metal I have ever used
*by J***R on November 30, 2025*

I bought the 14-piece cobalt set (upgrade over the Bosch titanium sets) almost two years ago (Jan 2024). I have been impressed enough with their performance to feel compelled to come back and review them, as well as buy a larger set (21-piece cobalt, which has a few sizes and duplicates that the 14-piece set doesn't include). In addition to occasional use of various sizes over the last two years on wood, PVC pipe, and aluminum, I used two of the bits in a single project to drill over a hundred holes in mild steel angle iron and rectangular tubing. I used a drill press, set up at a slower speed, along with plenty of cutting oil (sometimes reapplying midway through drilling a hole). In line with other bits I've used in the past, I expected the two bits I was repeatedly using to dull to the point of uselessness part-way through the project. Much to my surprise, both bits survived and still cut practically like they are new. Bottom line, if you are using these bits to drill into mild steel with a drill press set at a slower speed and generous application of cutting oil, these bits are a fantastic choice. I have also used these bits to drill into aluminum, PVC pipe, and woods of various hardnesses with absolutely no issues. Highly recommend any of the Bosch M42 cobalt bits.

### ⭐⭐⭐⭐⭐ Great Quality - Great results in use.
*by T***2 on January 18, 2026*

High Quality - never had a cobalt set before but from using this set i've been highly impressed. These stay sharp longer and provide a better cut compared to standard high volume big-box store brands like Dewalt.

### ⭐⭐⭐⭐⭐ 100% worth the cost
*by J***M on November 23, 2024*

Anything bosch makes is good, but i feel like they have it down pat when it comes to stuff like twist drills and bits. The M42 cobalt keeps the drill from getting too hot and also acts as a "lubricant", both contributing to keeping a sharp cutting edge, giving it quality and ease of use. These factors reduce the need for either resharpening, or worst, replacing the drill. The cost of cobalt bits are what scares people away, but if you're gonna be using it more than 2 or 3 times, its worth the upgrade from black oxide or a coated bit, thus giving it great value for money. The "M42" is a reference for the amount of cobalt used in the "material makeup" of the bit, with 8% cobalt being used in M42, and 5% cobalt in M35. Both are great options, but i recommend getting an M42 version when possible. The use of cobalt doesnt change the size or shape of the drill, although some will have different flute counts and designs, some tips have a "no pilot hole" start and some will have different degrees of an angle at the head to help with different types of material. Overall, storage capacity will not change unless you opt for different lengths, such as mechanics and aviation length. To sum this up, this is a great drill that should last a long time if used correctly. Bosch is very prevalent in my drill cabinet, so dont be afraid to spend a little extra and get the good one!

## Frequently Bought Together

- BOSCH CO2135B 1/8 in. x 2-3/4 in. Cobalt M42 Drill Bit (Pack of 2)
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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-04*