Screw driver bits set 38pc. 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 :23x25 mm. PH 0/1/1/2/2/3. PZ 0/1/1/2/2/3. SL 4/6/7. HEX 3/4/5/6. T 15/20/25/40. 5/6/7/8/10/11/13 mm. 3/4/5/6 mm