Screw driver bits set 46pc. The tip of a screwdriver is thermally treated to increase the time of use. Built with special steel is very stable and provides a rapid and efficient screw.The screws used for mounting on surfaces with different materials. Kit Contents: PH bits PH 0/1/2/3, PZ 0/1/2/3, SL 3/4/4,5/5/6/7/8/9, HEX 1,5/2/2,5/3/4/5/5,5/6, T 8/10/15/20/25/27/30/40 (25mm),Magnetic universal holder.