1/2" O.D. X 13/32" I.D. BRASS GUIDE BUSHING * All guides protrude 0.240" to work with any template material of 1/4" thickness and larger * Template guides can be used directly with any router having a base plate with a 1-3/16"* dia. center hole. * Works with all Black & Decker, DeWalt, Porter Cable®, & Skill routers