External Hex, External Torx, Internal Hex, Hex, TX
AF, Torx, Metric, Imperial, SAE
5.5 mm, 5/16 ", 9/16 ", 11/16 ", 28 mm
3/4, 1-1/2, 2-1/2, 1/2, 1
9.53, 19.05, 6.35, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide