4.5 in. double row diamond grinding cup wheel use the 4.5 in. double row diamond grinding use the 4.5 in. double row diamond grinding cup with any standard 5/8-11 arbor compatible grinder. designed specifically for masonry applications, the double row diamond matrix is comprised of hardened steel and embedded diamond fragments for fast and efficient removal of thinset, mortar, and other.A versatile, single phase high speed concrete grinder with a well-balanced weight capable of delivering productivity and performance reliability. the most powerful grinder in its class. it can grind up to 25-50sqm/hr with diamond plugs/discs. used in conjunction with an industrial vacuum cleaner for a dustless grinding.