Internal Hex, External Torx, External Hex, TX, Hex
Metric, Imperial, AF, Torx, SAE
9/16 ", 3/16 ", 7 mm, 5/16 ", 11/16 "
3/4, 1, 1-1/2, 2-1/2, 1/2
38.1, 19.05, 9.53, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide