External Hex, Internal Torx, Internal Hex, Hex, TX
Metric, Torx, AF, Imperial, SAE
9/16 ", 11/16 ", 3/16 ", 5/16 ", 7/16 "
1-1/2, 1/4, 2-1/2, 1/2, 3/4
6.35, 9.53, 19.05, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide