All distal surfaces of bicuspids and molars. Terminal shank reach is 7 mm. Nordent Rigid Gracey curettes feature a rigid shank and a longer reach blade and are well-suited to periodontal and surgical application. Nordent Rigid Gracey curettes have a 1.3 mm terminal shank diameter and blades that are 0.9 mm wide and 6 mm long. Featuring our DuraLite® ColorRings™ Handle.