Finned rollers have grooves on the surface and are permanently bonded to a steel insert. Designed to be mounted on a shaft. A hub extends past the roller and is supplied with two set screws (90 degrees apart) to fasten onto the shaft. The grooves create less surface contact on the work piece and allow dirt, debris and liquids to pass. Rollers are available in neoprene, nitrile and urethane materials with hardness ranging from 20 to 60 durometer.