Screw driver bits set 10pc. 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 1/1/2/2/3/3x25mm PZ bits 1/1/2/2/3/3x25mm, SL bits 4/4/5/5/6/6x25mm T bits 20/20/25/25/30/30x25mm,Magnetic universal holder.