Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Imperial, Metric, SAE
9/16 ", 3/16 ", 1/4 ", 9 mm, 25 mm
19.05, 25.4, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide