Internal Torx, Internal Hex, External Hex, TX, Hex
Torx, AF, Imperial, Metric, SAE
5/16 ", 5/8 ", 36 mm, 23 mm, 11/16 "
3/8, 1/2, 1/4, 1-1/2, 2-1/2
19.05, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide