Inverted cone burs are used primarily for producing undercuts at the junction of the pulpal floor and lateral walls in occlusal (Class I), cervical (Class V) cavities, and in the occlusal locks of the Class II cavities. Inverted cone burs are also useful for flattening pulpal and gingival walls. SS White blades are slightly rounded at the corners as an added protection against chipping and to give slightly rounded angles in keeping with adhesive guidelines.