Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Torx, Metric, SAE
5 mm, 7/16 ", 5.5 mm, 5/8 ", 9 mm
1-1/2, 3/4, 2-1/2, 3/8, 1/2
19.05, 38.1, 6.35, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide