DEWALT DW4775 7" double row diamond cup grinding wheel blister; High Diamond concentration for long life and aggressive material removal. Features large grinding segments with heat treated steel bodies which provides increases durability and wheel life. Double rim provides longer life and more aggressive material removal. Diameter 7", Arbor diameter 5/8 - 11", Max RPM 8,600. Designed for General Purpose masonry grinding; dry grinding of concrete and other masonry materials and for smoothing of uneven surfaces.