External Hex, Internal Torx, Internal Hex, TX, Hex
AF, Metric, Imperial, Torx, SAE
7/32 ", 9/32 ", 7/8 ", 5/16 ", 9 mm
9.53, 25.4, 6.35, 12.5, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide