Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Metric, Torx, Imperial, SAE
9/32 ", 5/16 ", 3/16 ", 8 mm, 9 mm
25.4, 6.35, 19.05, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate