Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, Metric, AF, Torx, SAE
7/8 ", 9/16 ", 5 mm, 5/16 ", 3/8 "
1-1/2, 3/4, 1, 2-1/2, 1/2
19.05, 25.4, 6.35, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate