For loosening defective nuts and screws The innovative spiral profile penetrates the screw head and allows it to be loosened despite damage to the hexagon With additional male hexagon on the drive In aluminum case Sockets, 10 mm (3/8") male square drive 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 19 mm Product description For loosening defective nuts and screws The innovative spiral profile penetrates the screw head and allows it to be loosened despite damage to the hexagon With additional male hexagon on the drive In aluminum case Sockets, 10 mm (3/8") male square drive 10 mm (3/8") 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 19 mm