These wheels are made from a red urethane bonded to a Aluminum core and come with bearings installed. Upgraded version now fits old and new style American 8(Super 8 / Standard 8), American 12, Clarke/Portercable F89, 504 and CF12. When used on older American 8 (Super 8 / Standard 8) or American 12 with the long old style wheel axle use one thick washer on each side of the wheel. When used on newer American 8 or American 12 with the shorter new style wheel axle use one thin washer on the inside of the wheel. When used on Clarke / Porter Cable F89, 504 and CF12 use one thin washer on the inside of the wheel.
