Internal Torx, External Hex, TX, Hex, 6-Point
Imperial, Metric, AF, Torx, SAE
7/8 ", 5/8 ", 23 mm, 36 mm, 1-1/2 "
3/4, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 6.35, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide