Double-End Threaded Stud, Material Steel, Material Grade/Class Class 8, Finish Black Oxide, Overall Length 27 1/2 mm, System of Measurement Metric, Thread Length A 7 1/2 mm, Thread Length B 18 mm, Thread Size A M6-1, Thread Size B M6-1, Dimensional Standards DIN 939, Rockwell Hardness C22 to C32, Package Quantity 100