Internal Hex, External Hex, Internal Torx, Hex, TX
AF, Metric, Torx, Imperial, SAE
5/8 ", 7/16 ", 9/16 ", 11/16 ", 28 mm
1-1/2, 1/4, 2-1/2, 3/4, 3/8
38.1, 9.53, 12.5, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide