External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
8 mm, 13/16 ", 9/16 ", 3/16 ", 11/16 "
1, 1-1/2, 1/2, 2-1/2, 3/4
19.05, 25.4, 6.35, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide