12.5 mm (1/2″) square drive. Socket bits with CV steel base and phosphate-coated special steel blades Contents: 1 socket bit ea. for screws with internal TORX® profile in T 20, T 25, T 27, T 30, T 40, T 45, T 50, T 55, T 60, T 70 (L 55 mm) 1 socket bit ea. for screws with internal TORX® profile in T 20, T 25, T 27, T 30, T 40, T 45, T 50, T 55, T 60, T