Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, Imperial, AF, Metric, SAE
5/16 ", 7/16 ", 9/16 ", 1/2 ", 5/8 "
1/2, 1-1/2, 3/8, 2-1/2, 3/4
9.53, 38.1, 6.35, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide