9 PCS EZChange grinding segment pad Metal Diamond Concrete Grinding Pad Scraper for concrete for HTC Grinding and Polishing Machine. Please note the price is for 9 pieces. You are welcome to order one grit in many grits. Soft Bond (For Hard Concrete). Hard Bond (For Soft Concrete). Medium Bond For Medium concrete. 1 superior sharpness 2 wear resistance 3 imporve efficency 4 save cost. Concrete, Stone and Terrazzo, floor grinding and leveling. Designed to smooth rough patched surfaces. The Trapezoid is a very aggressive segment that easily attaches to the segment plate. Grinds down bumps and rough joints. Will work on all concrete grinding machines. Metal backed works great on Magnetic Plates. Available in soft, medium and hard bonds. Long life and very aggressi. How to use and Effect picture on floor grinders.