Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
9/16 ", 3/16 ", 17 mm, 7/16 ", 11/16 "
1, 1/2, 3/4, 1-1/2, 2-1/2
25.4, 9.53, 19.05, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate