Screwdriver bits are suitable for power tools and air tools to drive various screws with different head types, such as slot, Phillips, hex, square, Torx, Star and so on. Special head types and overall length of those screwdriver bits can be upon customers special requests. Our bits are made of quality steel, such as high carbon steel, Cr-V steel (6150, 8660 and S2) with good torques and hardness to fit different application demands. Different surface treatments are available, such as sandblasted, Tin-coated, Zn-coated, Ni-coated, Cr-coated, Bright finished, Cu-coated and so on. All are with 1/4 Hex Shank (6.35mm Hex Shank).