3 Fedi Periodontal Chisel, #6 Handle 3 Fedi Periodontal Chisel, #6 Handle CPF36 The 3 Fedi Chisel is used for incisions that remove or recontour soft tissue and to excise interproximal tissue with 2.8mm working end at 40 degree angle. 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.