Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
9/32 ", 7/16 ", 5/16 ", 9/16 ", 3/16 "
1/4, 1/2, 3/8, 1-1/2, 3/4
12.5, 25.4, 6.35, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide