Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, AF, Metric, Torx, SAE
5/8 ", 18 mm, 5/16 ", 7/16 ", 11/16 "
1-1/2, 1/4, 2-1/2, 1/2, 1
19.05, 6.35, 38.1, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide