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