Covington's Rociprolap Plate Dresser is an excellent tool to keep your plate running true. The sintering on the diamond dresser provides fast removal of uneven spots on the plate. This dresser also works well on other plate machines. The small dresser is designed for the 20" and 24" units and is 11-1/2" across. The large dresser is designed for the 30" and 36" units and is 16" across.