External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, Torx, AF, Metric, SAE
7/16 ", 7/32 ", 9/16 ", 3/16 ", 11/16 "
3/4, 1-1/2, 1, 3/8, 2-1/2
25.4, 19.05, 6.35, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide