Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
7/32 ", 9/16 ", 5/16 ", 5/8 ", 25 mm
2-1/2, 1-1/2, 1/2, 1, 3/4
9.53, 25.4, 6.35, 12.5, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide