Bolt base grinding plate/pad with one segment, 1.57 x 0.39 x 0.39 (40 x 10 x 10mm) Designed for effective, efficient grinding Achieve maximum square footage at minimum cost Suitable for all types of concrete Use wet or dry Soft bond for hard concrete, medium for medium concrete, and hard bonds for soft concrete Grits. 6, 16, 30, 50, 100, 200, 400