Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, Torx, Metric, AF, SAE
4 mm, 5 mm, 7/32 ", 11/16 ", 5/16 "
1, 1-1/2, 2-1/2, 3/8, 1/2
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide