External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Imperial, Torx, Metric, SAE
5/8 ", 7/8 ", 8 mm, 9/16 ", 11/16 "
1/4, 1, 1-1/2, 2-1/2, 1/2
9.53, 38.1, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide