Internal Hex, External Hex, TX, Hex, External Torx
Metric, AF, Torx, Imperial, SAE
11/16 ", 5.5 mm, 16 mm, 5/8 ", 34 mm
1/2, 3/8, 1/4, 2-1/2, 3/4
19.05, 9.53, 25.4, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate