---
product_id: 23255034
title: "ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm"
brand: "atoplee"
price: "NT$760"
currency: TWD
in_stock: true
reviews_count: 8
url: https://www.desertcart.tw/products/23255034-atoplee-1pc-cobalt-step-drill-bit-m35-5-hss-co
store_origin: TW
region: Taiwan
---

# 9-step precision 1/4" hex shank HSS-Co durability ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm

**Brand:** atoplee
**Price:** NT$760
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate Your DIY Game with Precision Drilling!

## Quick Answers

- **What is this?** ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm by atoplee
- **How much does it cost?** NT$760 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/23255034-atoplee-1pc-cobalt-step-drill-bit-m35-5-hss-co)

## Best For

- atoplee enthusiasts

## Why This Product

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

## Key Features

- • **Enhanced Longevity:** Water cooling recommended to extend drill life.
- • **Durable Construction:** Crafted from M35 HSS-Co for superior wear resistance.
- • **User-Friendly Design:** Compatible with pistol and bench drills for seamless operation.
- • **Precision Engineering:** 9-step design for perfect hole sizes every time.
- • **Unmatched Versatility:** Drill through metal, wood, and plastic with ease!

## Overview

The ATOPLEE Cobalt Step Drill Bit is engineered from high-quality M35 HSS-Co material, featuring a 1/4 inch hex shank and 9 precision steps ranging from 4mm to 12mm. Ideal for drilling through tough materials like stainless steel and aluminum, this drill bit combines durability with versatility, making it a must-have for any professional or DIY enthusiast.

## Description

ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm

## Features

- {High-quality material }Using HSS-Co material, through heat treatment, high hardness and high wear resistance, toughness and bending strength, sharp cutting edge can be obtained, which is the best choice for stainless steel processing.
- {Size} Handle diameter:1/4"(6.35mm);Step quantity: 9steps;Handle length:31mm;Edge length:50mm;Step diameter:4/5/6/7/8/9/10/11/12mm.
- {Note} Applicable machines: pistol drill, bench drill. Water injection cooling while working can effectively extend the life of the drill bit. The recommended drilling speed is 250-400 rpm.
- {Usage}Suitable for drilling holes in workpieces with higher hardness, such as stainless steel, carbon steel, aluminum, iron, etc.
- {Package Included} 1pc HSS-Co Straight Slot Hex Handle Step Drill

## Product Details

- **Material:** HSS Cobalt
- **Cutting Diameter:** 12 Millimeters
- **Shank Type:** Hex
- **Brand:** ATOPLEE
- **Tool Flute Type:** Spiral

## Images

![ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm - Image 1](https://m.media-amazon.com/images/I/616qvo4Ho0L.jpg)
![ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm - Image 2](https://m.media-amazon.com/images/I/61bZraX9KaL.jpg)
![ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm - Image 3](https://m.media-amazon.com/images/I/61thTSYAatL.jpg)
![ATOPLEE 1pc Cobalt Step Drill Bit,M35 5% HSS Co,Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Metal, Copper, Aluminum, Wood, Plastic,9 Steps,4-12mm - Image 4](https://m.media-amazon.com/images/I/61QF1q4O--L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ great metric stepped bit for harder steels
*by R***. on July 26, 2023*

I've mostly used this to open holes in 1/8in mild steel to 10mm in tight spaces(inside a powered recliner). Between mine and another a coworker used, we've drilled out ~50+ off these holes for repair purposes with no degradation in cutting ability.I'm a believer in cobalt bits for constant steel use. Sure HSS will work for mild steel, but won't stay sharp nearly as long in my opinion. This bit also is much shorter than a lot of dedicated bits in the size range it covers which is also helpful for my purposes. Metric stepped bits are hard to find domestically so this had been great.

### ⭐⭐⭐⭐⭐ Top notch
*by R***A on August 8, 2020*

Makes short work of 304 stainless steel, that's for sure! Very heavy duty and well made. Drills fast and especially handy if you need to quickly enlarge a hole, but don't require reaming accuracy.

### ⭐⭐⭐⭐⭐ Awesome
*by T***7 on November 26, 2019*

Works great for drilling holes in thin car sheet metal!

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**Shop now:** [https://www.desertcart.tw/products/23255034-atoplee-1pc-cobalt-step-drill-bit-m35-5-hss-co](https://www.desertcart.tw/products/23255034-atoplee-1pc-cobalt-step-drill-bit-m35-5-hss-co)

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-01-24*