Please note this assembly does not come with the original plastic gear (which are obsolete). Substitute Renovo Parts metal gears or longer life and improved performance. View that listing here: https://www.renovoparts.com/406-13-051-0006-r-and-406-13-051-0007-r-gear-set/ Delta's 406-13-406-0001 Plastic Gear and Shaft Assembly is no longer available. Fits the following Drum Sander models: 31-250 31-252 31-255X 31-260X