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 1 mm, 2 mm. PZ 1 mm, 2 mm, 3 mm. HEX 4 mm, 5 mm. T 20 mm, 25 mm.