External Hex, External Torx, Internal Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
7/16 ", 11/16 ", 15/16 ", 5/8 ", 33 mm
1-1/2, 3/4, 1, 2-1/2, 1/2
9.53, 12.5, 19.05, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide