3M(TM) Diamond Cloth Belt 651WY, 1 1/2 in x 30 in 400 Mesh, 1 per case Micron-graded diamond particles affixed to durable waterproof cloth backing with tough resin bond. Available in sheets, discs, belts and rolls. For grinding and polishing ceramics, carbide, cast iron. 1 1/2 in x 30 in 400 Mesh, 1 per case.