Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
5/16 ", 7/16 ", 5.5 mm, 19 mm, 11/16 "
1/4, 3/4, 1-1/2, 2-1/2, 3/8
19.05, 9.53, 6.35, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate