Hollow Chop Contouring Pliers Hollow Chop Contouring Pliers 678-310 Perfect for subtle contouring of stainless steel arch wires up to .030" (.76 mm). 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.