Internal Hex, External Hex, Internal Torx, Hex, TX
AF, Torx, Imperial, Metric, SAE
6 mm, 5/16 ", 5/8 ", 28 mm, 29 mm
1, 1-1/2, 1/4, 2-1/2, 3/8
25.4, 9.53, 38.1, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide