25 piece Mini X-Line Screwdriver Bit Set. 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: 16 screwdriver bits L = 25 mm PH 1/2/3 PZ 1/2/3 SL 4.5/5.5/8.0 HEX 4/5/6 T 15/20/25/30, 8 screwdriver bits L = 50 mm PH 1/2/3 SL 4.5/5.5 T 15/20/25, Magnetic universal holder.