Internal Hex, Internal Torx, External Hex, Hex, TX
Metric, Imperial, AF, Torx, SAE
9/16 ", 7 mm, 5/16 ", 25 mm, 11/16 "
2-1/2, 1-1/2, 1/2, 3/8, 1
6.35, 19.05, 12.5, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide