Clamp, Rubber Dam, RDCM13A-G Clamp, Rubber Dam, RDCM13A-G RDCM13A Serrated offset jaws with grooves for lower left molars; paired with RDCM12A-G. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.