Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
5/16 ", 7/16 ", 5/8 ", 23 mm, 11/16 "
3/4, 1/4, 3/8, 2-1/2, 1/2
6.35, 19.05, 12.5, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide