75 Kramer-Nevins Bone Chisel 75 Kramer-Nevins Bone Chisel CKN75 The 75 Kramer-Nevins Chisel is is designed for contiguous bone graft procedures, compacting bony walls after bone grafting, and is useful for removal of exostosis and tori. 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.