These Faithfull 1/4in Hex Drive Phillips Screwdriver Bits are made from high-strength, specially heat-treated S2 grade chrome vanadium steel for specific use in screwdriving applications. The bits are both shock and wear-resistant and are coated with titanium for extra durability. They are suitable for use with the correct bit holder in most hand-held, mains and cordless drill drivers. Specification: Size: PH3. Shank: 1/4in Hex. Length: 50mm. Pack of 3.