Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Imperial, Metric, SAE
7/8 ", 3/16 ", 19 mm, 25 mm, 11/16 "
38.1, 19.05, 12.5, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide