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 hexagon socket profile in 5, 6, 7, 8, 10, 12, 14, 17, 19 mm (L 55 mm) 1 socket bit ea. for screws with hexagon socket profile in 5, 6, 7, 8, 10, 11, 12, 13 mm (L 100 mm) 1 socket bit ea. for screws with hexagon