External Hex, Internal Hex, Internal Torx, TX, Hex
AF, Imperial, Torx, SAE, Metric
5/16 ", 7/16 ", 9/16 ", 15/16 ", 25 mm
12.5, 19.05, 9.53, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide