Covington's Diamond Abrasive System is a magnetic mounting system that uses on head for all grinding operations. Simply attach the adhesive-backed, flexible magnetic holder to the grinding head. No additional adhesive, or shaft nuts are required. The grinding head is now ready to take diamond cutting discs. Position the grinding head on the magnet and it is ready to use. Use the coarse disc (100g) to remove large amounts of material. Use the medium disc (220g) to improve the surface finish and prepare the piece for finer grinding. The fine disc (600g) quickly removes the medium finish and prepares the surface for pre-polish. Diamond Compound can be used as a pre-polish (8,000mesh) or final polish (14,000mesh to 50,000mesh) on a polish plate.