7" Long Lasting Diamond Cup Wheels for Concrete, Epoxy, Paint, Mastic Grinding - 5/8"-11 Arbor Long lasting grinding wheel designed to remove paints, epoxies, mastics, water-proofing coating, markings & lines. Grind curb gutters, expansion joints, high spots, or prep surfaces for coating. Supreme Grade Bi-Turbo-Style diamond cup wheels contain higher grade and high concentration diamond than the premium series for extra long life,#30/40 diamondfor aggressive grinding andfast stock removal. 7" diameter, 5/8"-11 threaded #30/40 diamond grit