Detailed Product Description Abrasive Disc.1) Material: Green Aluminum Oxide.2)Grit: P80-P1500.3)Diameter: 4", 4-1/2",5", 6", 7" etc.4)Hole: as your requirement.5) 20' container may be loaded about 1,400,000 pcs of 5" disc.*To use this product saves time and effort. It is the ideal of manufacturing rust removal, polishing such as wood, paint or stone etc.