Internal Torx, Internal Hex, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
5.5 mm, 13 mm, 1/4 ", 5/8 ", 11/16 "
1/4, 3/8, 1/2, 3/4, 2-1/2
6.35, 9.53, 19.05, 25.4, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate