Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Metric, Imperial, SAE
18 mm, 5/16 ", 29 mm, 9 mm, 11/16 "
1/2, 1/4, 3/4, 1-1/2, 3/8
19.05, 38.1, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide