These sanding discs have a special sharp, durable alumina grain that gives you a fast and exceptionally long-lasting polishing. Durable alumina, combined with urea resin over glue bonds create a high performance sandpaper. Sanding discs are cleanly with 8 holes for uniform dust extraction through the pad without creating unwanted swirl marks or scratches on the work surface. Features: Made of alumina, strong polishing force, high wear-resisting degree and cost performance. Can work with polishing sticky backing pad, simple and easy to use. Professional, safety, high efficiency and low consumption. Improved abrasion performance, abrasive will not easily fall off. Used in furniture, hardware and automobile repairing. For surface polishing of iron, paint, electronics, wood furniture and many kinds of solid wood plank. Specifications: Materiel: Alumina Size: 125mm / 4.92" Thickness: 0.05mm / 0.002" Color: Red Number of Holes: 8 holes Granularity: 60#, 80#, 100#, 120#, 150#, 180#, 240#, 320#, 800#, 1000#(optional) Quantity: 10pcs per bag How to Use: 1.Sanding papers coated with alumina bound with synthetic resin are the perfect choice for working of all wood, wood-based materials, and metal, from coarse sanding to fine sanding. 2.60 grain are used for coarse sanding of rough surfaces, 80-120 grain are suitable for surface smoothening and sanding of small roughness, 180-1000 grain are good for final fine sanding. Package Includes: 10pcs x Sanding Discs Note: 1, Need to add sandpaper glued to the sticky adhesive disc to disc fixed polished. 2, Use an electric drill still need to add converter. 3, Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 4, Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.