Internal Hex, External Hex, Hex, TX, External Torx
Imperial, AF, Metric, Torx, SAE
9/16 ", 11 mm, 34 mm, 36 mm, 32 mm
1/2, 1/4, 3/4, 2-1/2, 3/8
6.35, 19.05, 25.4, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide