For loosening defective nuts and bolts The innovative spiral profile penetrates the screw head and enables loosening despite damage to the hexagon With additional hexagonal male part on the gear< /p> In aluminum box Socket wrench inserts, transmission through 10 mm (3/8") external square 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 19 mm Product description For loosening defective nuts and bolts The innovative spiral profile penetrates the screw head and enables loosening despite damage to the hexagon With additional external hexagon on the gear In aluminum box Socket wrench inserts, transmission through square 10 mm (3/8") external thread 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 19 mm