No need for an arbor adapter with our Dico mandrel mounted Flannel Buff: Ultra-soft flannel material, 4" diameter, "cushion" sewn ("bulls-eye" fashion), 1/2" thick buff, 1/4" hex mandrel mounted for quick change versatility. Ideal for your final step buffing operations. Use with any electric drill. Always use with Dico premium buffing compounds. Made and packaged in USA!