Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
7/16 ", 5/8 ", 3/16 ", 5.5 mm, 32 mm
1, 2-1/2, 1-1/2, 3/8, 1/2
9.53, 19.05, 6.35, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide