An earth-boring bit for attachment to a drill string has rotatable cones with rows of cutting elements. The cutting elements are arranged in generally circumferential rows on each of the cones and interference fit into apertures in the shell surface. The rows include a heel row of cutting elements on...http://www.google.fr/patents/US6443246?utm_source=gb-gplus-shareBrevet US6443246 - Long barrel inserts for earth-boring bit
