Internal Hex, External Torx, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
5 mm, 9/16 ", 3/16 ", 5.5 mm, 28 mm
1-1/2, 3/8, 2-1/2, 1/2, 1/4
38.1, 6.35, 9.53, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide