DMT B8250-MBA Duo Base Bench Stone Accessory with Magna-Base Adapter A must have accessory for any 6" x 2", DuoSharp and Diameter-Sharp bench stones Easy snap-in clips to fit DuoSharp bench stones or MagnaBase Adapter for Diameter-Sharp bench stones Provides 2" knuckle clearance for ease of use Features convenient handle on underside for moving stone over large work piece with DuoSharp bench stone. Not for use with the Diameter-sharp bench stone Durable construction will provide years of consistent performance and reliable service