Internal Hex, External Hex, Hex, TX, 6-Point
Metric, Torx, AF, Imperial, SAE
16 mm, 9/16 ", 9 mm, 29 mm, 1-1/2 "
1/4, 1-1/2, 1, 2-1/2, 3/8
9.53, 25.4, 38.1, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate