3 Kramer-Nevins Bone Chisel 3 Kramer-Nevins Bone Chisel CKN3 The 3 Kramer-Nevins Chisel is a long, mono-beveled chisel used to widen and split bone with 7.5mm working end. 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.