The Factory sprocket holder is an essential replacement part when changing the stock holder, sprockets & chain on my 250 virago bobber project bike. The old one was not holding my new sprocket snug as it was just loose enough to become a problem after a few miles. The new one made the drive line smoother and nicer to ride. Came in a new yamaha factory package and was as new as my chain, front & rear sprocket. Good price for this unit. Recommended for sure.