Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, Metric, SAE
3/4 ", 3/16 ", 13 mm, 5/8 ", 34 mm
1/4, 3/8, 1-1/2, 2-1/2, 1/2
25.4, 6.35, 38.1, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate