Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Torx, SAE, Metric
4 mm, 9/32 ", 15/16 ", 7/8 ", 9/16 "
38.1, 6.35, 25.4, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide