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Tight Connection 1)When sanding disc is working, thread direction of disc is opposite to the force of friction, which makes the connection between disc and tray/holder more and more tight, ensures steady working even in high speed. Always Sharp Grinding material Aluminum oxide has superior hardness, offering strong fast cutting, easy to deal with metal, cast iron and other hard materials.SiC is brittle too, irregular fracture and collapse broken happens when grinding, keep producing new edges and corners to keep sharp, so it works for longer compared to other discs. Adaptable Structure Special fiber and abrasive particles establish an open-mesh 3D structure, suitable for different shapes of various objects. Extensive Use Wrightus Sanding Discs fit various surface conditioning and preconditioning, oil paint removal, rust removal, glue or adhesive removal, self-sharpening, sanding, cleaning, grinding, stripping, deburring, polishing, finishing,etc. Perfect for detail work on tighter contoured areas and it provides sufficient coverage area to handle larger surface, it plays well on almost all surface. Package Includes 10x Fine Surface Conditioning Disc, Green 10x Medium Surface Conditioning Disc, Red 10x Coarse Surface Conditioning Disc, Brown Specification Material: nylon, Aluminum oxide, plastic Blue Disc: fine, appr 400-600 Grit Red Disc: medium, appr 150 Grit Brown Disc: coarse, appr 120Grit