Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, Torx, AF, Metric, SAE
4 mm, 5.5 mm, 7/32 ", 7/8 ", 9/16 "
3/4, 1-1/2, 2-1/2, 1/2, 1
38.1, 19.05, 25.4, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate