Concrete Grinding Plate for Swing Machines with 5 Cup Wheels MAX RPM 175. 223. 10. FREE Shipping. OCR 4" Concrete Turbo Diamond Grinding Cup Wheel Three Row Turbo Cup Disc Grinder for Angle Grinder 12 Segs Heavy Duty (Yellow 12segs B) out of 5 stars 315. 10. 99. Get it as soon as Mon, Aug 19.