Features: The unique surfaces designs improves chip evacuation efficiency, reduces debris blockage on the sanding disc and polishing surfaces, and enhances heat dissipation efficiency, ultimately promoting polishing effectiveness; The revolutionary design increases the speed of discharge of wear debris during the sanding process. excellent anti-blocking and heat dissipation functions greatly prolongs the roll life; Great for construction, carpentry, auto body repair project, automotive polishing, and home improvement projects, suitable for wood, metal, plastic, drywalls, fiberglass porcelain, art, and craft as well as corner cleaning and polishing; With special process, the cloth base will not tear and sand will not fall offing, so the grinding effect will be a little rougher than the redness sanding disc. It can be used by watering (not soaking in water). Perfect for use in woodworking shops, metal fabrication facilities, or at homes for furniture restoration projects, ensuring smooth and polished finishes. Specifications: Component:Aluminium Oxide Diameter: Approx.100mm/3.93inch Diameter: Approx.125mm/4.92inch Product name: disc sandpaper Color: Blue Items: 60Grit/80Grit/100Grit/120Grit/150Grit/180Grit/320Grit/400Grit Product use: mostly used for grinding, polishing, derusting, grinding Package Includes: 100pcs/set Sanding Discs note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.