Feature: 1. Rust Proof Durable: This double headed hand drill is made of brass and electroplated. It is rust proof, durable and long service life 2. Wide Range Applications: Suitable for electronic assembly, tool making, model making and hobbies 3. 2 Collet Design: 2 chucks with clamping size from 0.5 mm to 3.2mm. Meet your needs 4. Ergonomic Design: Has a 3 jaw collet, ergonomic handle, easy to hold and compact size, which is very suitable for putting in a toolbox or pocket 5. Be Careful: Suitable for PCB, handicrafts, jewelry, clock manufacturing, etc. it is not suitable for hard objects such as steel, iron stone and stone Specification: Item Type: Double Hand Drill Material: Brass ,High Speed Steel Usage: Suitable for PCB, Handicraft, Jewelry and Watch Making Color: Silver Double Head Hand Drill Face Treatment: Electroplating Treatment Specifications of Twist Drill: Approx.0.8mm / 0.03in Approx.1.0mm / 0.04in Approx.1.2mm / 0.05in Approx.1.5mm / 0.06in Approx.1.8mm / 0.07in Approx.2.0mm / 0.08in Approx.2.2mm / 0.09in Approx.2.5mm / 0.1in Approx.2.8mm / 0.11in Approx.3.0mm / 0.12in Clamping Range of Double Head Hand Drill Chuck: Approx. 0.5-3.2mm / 0.02-0.12in. Package List: 10 x Micro Twist Drill 1 x Double Hand Drill