Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, AF, Torx, SAE, Metric
9/16 ", 3/16 ", 7/16 ", 5/8 ", 35 mm
1-1/2, 1, 2-1/2, 3/4, 1/4
38.1, 19.05, 25.4, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide