External Hex, Internal Hex, External Torx, TX, Hex
AF, Metric, Imperial, Torx, SAE
7/8 ", 9/16 ", 7 mm, 9 mm, 11/16 "
3/4, 1/4, 2-1/2, 1-1/2, 3/8
38.1, 9.53, 25.4, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide