Internal Hex, External Hex, Hex, TX, 6-Point
Metric, Torx, Imperial, AF, SAE
11/16 ", 34 mm, 29 mm, 1-1/2 ", 9 mm
3/4, 1, 2-1/2, 1-1/2, 1/2
6.35, 12.5, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate