Internal Hex, External Torx, External Hex, Hex, TX
Imperial, Torx, Metric, AF, SAE
9/16 ", 9/32 ", 1 ", 3/16 ", 5/16 "
1/2, 1, 1-1/2, 3/4, 2-1/2
9.53, 38.1, 19.05, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate