External Hex, Internal Hex, Internal Torx, Hex, TX
Imperial, Torx, Metric, AF, SAE
11/16 ", 15/16 ", 7/16 ", 9/16 ", 9 mm
12.5, 25.4, 19.05, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide