Internal Torx, External Hex, Internal Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
5/16 ", 7/16 ", 5 mm, 3/16 ", 11/16 "
1-1/2, 3/8, 2-1/2, 3/4, 1/2
38.1, 12.5, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide