External Hex, Internal Torx, Internal Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
5/16 ", 9/16 ", 5 mm, 32 mm, 1-1/2 "
1, 3/4, 2-1/2, 1-1/2, 1/2
9.53, 25.4, 6.35, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate