Screwdriver Bit Set (32 Pieces). The tip of a screwdriver is thermally treated to increase the time of use. Built with special steel and cobalt coating is very stable and provides a rapid and efficient screw.The screws used for mounting on surfaces with different materials. Kit Contents: 1 x universal holder, 4 x PH Bits 1/2/2/3, 4 x PZ Bits 1/2/2/3, 4 x SL Bits 3/4/5/6, 4 x HEX Bits 3/4/5/6, 8 x TORX Bits 10/15/20/20/25/27/30/40, 7 x TH Bits 10/15/20/25/27/30/40.