3M(TM) Diamond Premium Non-resettable Single Point Dressing Tool TR5P7, .50 ct, 7/16 in x 2 in shank, 45°, 1 per case Premium,non-resettable, single point diamond tools are superior, general purpose dressers. Made with more durable diamond they are used for face dressing, external radii and large internal radii on ceramic grain wheels and other difficult-to-dress wheels.