The D-Stop 5/8" Stopper is a revolutionary new 2-part stopper system! The set consists of a high quality machined aluminum 5/8" post, with nut and washer to fit your 5/8" stopper hole on plate. Then you attach the rubber stopper via 5/16" screw. This way you'll save money by just replacing the rubber stopper as it wears out – not the metal post! The set includes 2 complete stoppers to fit Dominion aluminum or Nylon plates and others that accept the 5/8" screw-in type of stopper. Stopper rubber comes in white or black or orange.