Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Metric, Torx, SAE
9/16 ", 7/16 ", 35 mm, 30 mm, 1-1/2 "
1-1/2, 1/4, 2-1/2, 1/2, 3/8
9.53, 38.1, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide