Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, Metric, SAE
11/16 ", 5/16 ", 5/8 ", 9/16 ", 3/4 "
1, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate