External Hex, Internal Hex, Internal Torx, TX, Hex
Torx, Imperial, AF, Metric, SAE
13/16 ", 3/4 ", 7/8 ", 9/16 ", 3/16 "
1-1/2, 3/4, 1, 2-1/2, 1/2
25.4, 6.35, 19.05, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide