458-741402-9AP Features: -For metal polishing and general flat grinding.-Aluminum Oxide abrasive grains are evenly distributed to give a smooth surface.-4" x 1/4" 5/8" arbor.-13,7000 RPM.-5 pack .-4"" x 1/4"" 5/8"" Depressed Center Grinding Wheel Arbor(5 Pack). Warranty: -1 yr warranty on material and workmanship.