Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
5/8 ", 9/16 ", 3/16 ", 1/2 ", 11/16 "
3/4, 1-1/2, 1/4, 2-1/2, 3/8
6.35, 12.5, 38.1, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide