Internal Torx, External Hex, Internal Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
5.5 mm, 11/16 ", 15/16 ", 9/16 ", 3/16 "
1, 2-1/2, 1-1/2, 1/2, 1/4
38.1, 25.4, 9.53, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate