NEW SOUTHWEST SPEED 7" CARBIDE TIRE GRINDING DISC FOR REJUVENATING TIRES, MODIFIED, LATE MODEL, STREET STOCK, FACTORY STOCK, GRAND NATIONAL, PURE STOCK, MINI STOCK, DWARF CAR, LEGENDS Brand New Southwest Speed Carbide Grinding Disc, 5/8-11 Thread 7". SWS Part # 790-018 * 7" O.D. Carbide Tire Grinding Disc * 5/8"-11 Thread Nut Welded In The Middle Enables You To Rejuvenate Your Old Tires