Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
15/16 ", 7/16 ", 5/16 ", 5/8 ", 34 mm
1/4, 2-1/2, 1-1/2, 1/2, 3/4
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