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