External Hex, Internal Hex, Internal Torx, TX, Hex
Torx, Imperial, AF, Metric, SAE
7/16 ", 5/16 ", 9/16 ", 3/16 ", 29 mm
1/4, 2-1/2, 1/2, 1-1/2, 3/4
9.53, 12.5, 25.4, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide