Description: These screwdriver bits are made of high quality S2 material which is durable, anti-impact and tough. Magnetism enables them to fix on screwdrivers firmly. With star head, they are widely used in electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth. What are you waiting for? Get this set and make your life easier. Features: Made of high quality S2 steel material which is durable, anti-impact and tough, a commonly used material in hardware. Magnetic and thus can be firmly fixed on screwdrivers and suck the screws easily upon using it. Exquisite workmanship, each edge can be accurately locked screws, no damage to the screw, and the screwdriver head. 8 different sizes to meet your varied requirements. Can be used for manual or electric screwdriver, electric drills, air drills and other tools. Specification: Material: S2 Steel Color: As shown in the pictures Type of head: Star Type of shank: approx. 6.35mm / 0.25" Size: T8, T10, T15, T20, T25, T27, T30, T40 Overall length.: approx. 150mm / 5.91" Quantity: 8pcs Package Includes: 8 x Screwdriver Bits Notes: Do not turn the screws with unmatched size, in case get both screw and bit damaged.