Sink Drum Wheels are a kind of polishing tool that is made in the shape of drum. They are made with special resin bonds and diamond particles to provide shining gloss on stone edges or inside radius. The grit degree often varies from #50 to #3000, and the size of them includes 1″, 2″ and 3″. There are two connection threads available: M14 and 5/8″-11.