Made of durable material with high accurate process to provide and high precision. The operation is very simple, allowing you to turn the drill quickly and beautifully. Allow you single-hand operation, let you use it more conveniently. The surface is treated with a titanium, which greatly improves the cutting performance of the drill, is more wear-resistant and prolongs the service life. Features - ColorAssorted Color - Material: Carbon Steel. - Size: About 7.2X1X1cm/2.83X0.39X0.39inch. - Adoption of , this product is durable, handy and long-time use. - The surface is treated with a titanium, which greatly improves the cutting performance of the drill. - design drill bits, accurate and fine, increase drilling speeds. - It is more wear-resistant and prolongs the service life. - for home DIY, building and engineering use etc. Package list: 7 x Spiral Tap Drill Bits