External Hex, Internal Hex, External Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
5/16 ", 7/16 ", 7/8 ", 34 mm, 29 mm
38.1, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide