Internal Hex, External Hex, External Torx, Hex, TX
Imperial, AF, Torx, SAE, Metric
1 ", 9/16 ", 5.5 mm, 34 mm, 23 mm
1-1/2, 1/4, 3/8, 2-1/2, 1/2
19.05, 38.1, 9.53, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide