Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
7/16 ", 6 mm, 11/16 ", 9/16 ", 11 mm
1/4, 2-1/2, 3/4, 1/2, 3/8
9.53, 38.1, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide