Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
3/16 ", 5.5 mm, 1/4 ", 5/16 ", 5/8 "
1, 1-1/2, 2-1/2, 1/4, 3/8
19.05, 25.4, 38.1, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide