Internal Hex, External Hex, Internal Torx, TX, Hex
Metric, AF, Torx, Imperial, SAE
7/16 ", 5.5 mm, 7/8 ", 10 mm, 3/4 "
38.1, 25.4, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide