TheMK-804CG-1 cup wheel is designed for floor preparation work prior to the polishing process. It is designed for grinding thick coatings, epoxy, urethane, and other membrane materials. The arrow shaped segment allows for scraping and grinding at the same time. This cup wheel features venting holes to dissipate heat for extended wheel life. These diamond cup wheels provide fast production rates and long life and can be used for wet or dry grinding.