3-Inch Sanding Discs Set No Hole 100 Pieces Function of Different Grits · 40-240 Grit: Coarse finishing, suitable for polishing metal, wood and other hard or rough objects. · 240-600 Grit: Fine finishing, suitable for light sanding. · 600-2000 Grit: Well finishing, suitable for fine polishing or buffing mahogany furniture, bodhi seeds, jade and so on. Hook and Loop Backing · Strong adhesion, not easy to fall off, more convenient to use. Premium Quality · Stable aluminum oxide grain and latex base paper for long term use, anti-static and resist moisture. Widely Application · Widely used in automobile, woodworking, marine, industrial，handicrafts, etc. How to Use About SPEEDWOX · Over 60 years of OEM manufacturing experience, speedwox can provide stable high quality products. · We devote ourselves to make SPEEDWOX as a well-known hand tools brand, to provide customer more high quality and practical hand tools for a long term. Attention Keep out of children's reach. Please check the grits and sizes before purchasing. Please do not soak in water.