Double-End Threaded Stud, Material Steel, Material Grade/Class Class 8, Finish Black Oxide, Overall Length 65 mm, System of Measurement Metric, Thread Length A 25 mm, Thread Length B 46 mm, Thread Size A M20-2.5, Thread Size B M20-2.5, Dimensional Standards DIN 939, Rockwell Hardness C23 to C34, Package Quantity 25