Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, Metric, SAE
11/32 ", 13 mm, 5/16 ", 9/32 ", 9 mm
19.05, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide