Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, Metric, SAE
9/16 ", 16 mm, 1/4 ", 5/8 ", 1-1/2 "
3/4, 1-1/2, 2-1/2, 3/8, 1
25.4, 38.1, 9.53, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide