Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Metric, Torx, SAE
7/16 ", 13 mm, 3/16 ", 5/8 ", 11/16 "
1, 1-1/2, 2-1/2, 3/4, 1/2
6.35, 25.4, 9.53, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide