India Aluminum Oxide Silversmith Precision Abrasive File is designed for deburring, chamfering or radiusing job or for filing delicate parts. BB/Rectangle shaped abrasive file holds its shape while imparting the finest, uniform finish on precision machine parts and in tool and die making. Stones, manufactured with aluminum oxide abrasive, are preferred for imparting durable, smooth-cutting edges and for close tolerances. Aluminum oxide precision-shaped stones are generally used by silversmiths and mechanics for close tolerance lapping, touching-up instruments as well as for cleaning tools and dies.