Internal Hex, External Torx, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
9/32 ", 9/16 ", 15 mm, 5.5 mm, 30 mm
1, 3/8, 2-1/2, 1/2, 1-1/2
9.53, 19.05, 25.4, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Phosphatized, Oxidised, Black Phosphate