Internal Hex, External Hex, Internal Torx, TX, Hex
Metric, Imperial, Torx, AF, SAE
3/16 ", 11/16 ", 29 mm, 1-1/2 ", 10 mm
3/8, 1-1/2, 2-1/2, 3/4, 1/2
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide