External Hex, Internal Torx, TX, Hex, 6-Point
Imperial, AF, Torx, Metric, SAE
15/16 ", 5 mm, 7/16 ", 5/8 ", 11/16 "
1-1/2, 3/4, 1, 2-1/2, 1/2
12.5, 19.05, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide