External Hex, Internal Torx, Internal Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
5/16 ", 9/16 ", 5 mm, 3/16 ", 30 mm
38.1, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide