Internal Torx, External Torx, Internal Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
11/16 ", 7/16 ", 5/16 ", 23 mm, 1-1/2 "
9.53, 19.05, 12.5, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide