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.The Faithfull FAISBPH3M Titanium coated S2 steel Phillips screwdriver bits have the following specifications:Size: PH3. Shank: 1/4 inch hexagon. Length: 50mm. Pack quantity: 3.