External Hex, Internal Hex, Internal Torx, Hex, TX
Imperial, Torx, AF, SAE, Metric
5/16 ", 5/8 ", 5.5 mm, 11/16 ", 1-1/2 "
3/4, 1/4, 2-1/2, 1-1/2, 1
25.4, 12.5, 38.1, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide