Specifications:Using premium quality copper and high speed steel material, they are very durable and practical to use.This set will allow you to get into those tight spaces much easier, it is a nice set for your handyman.It is suitable for manual drilling of wood, bone horns, amber, olive pits, walnuts, plastics and other materials.Item Name: Drill Bits SetMaterial: Copper, High Speed SteelClamping Range: 0.3cm - 3.4cmTwist Drill Bits Specifications (10Pcs): 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mmTwist Drill Bits Specifications (20Pcs): 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mmFeatures: Drilling Tools, Durable, Portable, MultifunctionCopper Bit Holder Length: 10cm/3.94" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Copper Bit Holderor1 x Copper Bit Holder10 x Twist Drill Bitsor1 x Copper Bit Holder20 x Twist Drill Bits