High Quality: Superior in performance with good durability, plasticity and flexibility, high abrasion resistance and fast grinding force,Safety torque spiral design with strong flexibility and long service lifeOpen nylon web structure leading to better elasticity and plasticity, suitable for different shapes of various objects，Surface Conditioning Discs combine durable, a non-woven disc with the efficiency of the quick-change attachment system for an effective disc that cleans, finishes, blends, and deburrs. The non-woven fiber construction conforms well to help preserve irregular or contoured surfaces and the backing supports the disc for aggressive cutting. Package Includes: 8x Fine Surface Conditioning Disc, Green 8x Medium Surface Conditioning Disc, Red 8x Coarse Surface Conditioning Disc, Brown 1 x 1/4" shank Roloc disc pad holder Specification: Material: nylon, Aluminum oxide, plasticShank: Round rod 1/4 inchType: R-TypeGrit Type: Medium,Coarse,Fine Grit: Blue Disc: fine, appr 240-400 GritRed Disc: medium, appr 150 GritYellow Disc: coarse, appr 80Grit Surface treatment discs are suitable for stainless steel, alloys, non-ferrous materials, plastics and fiberglass; suitable for auto body and automotive work such as rotor finishing, as well as motorcycles, boats, etc. Abrasive sanding discs are ideal for deburring, finishing, and cleaning on flat or contoured surface of metals to allow for quick and easy operator assembly. These flap discs are suitable for die casting parts, bicycle parts, machinery, knives, and many other items.