Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Metric, Imperial, SAE
5/8 ", 3/16 ", 16 mm, 11/16 ", 23 mm
19.05, 6.35, 25.4, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide