Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, AF, Metric, Torx, SAE
7/32 ", 7/16 ", 5/8 ", 5/16 ", 3/4 "
3/4, 1-1/2, 2-1/2, 1/4, 3/8
25.4, 38.1, 9.53, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide