Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
7/16 ", 9/32 ", 11/16 ", 9/16 ", 5/16 "
1, 1-1/2, 3/4, 2-1/2, 1/2
19.05, 6.35, 9.53, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide