Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, Metric, SAE
3/16 ", 7 mm, 5/16 ", 7/16 ", 23 mm
3/8, 2-1/2, 1-1/2, 1/2, 1
38.1, 19.05, 25.4, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate