Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
5/16 ", 7/16 ", 5/8 ", 11/16 ", 25 mm
1, 1-1/2, 2-1/2, 1/4, 1/2
9.53, 25.4, 12.5, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Phosphatized, Oxidised, Black Phosphate