Pro-Graad Surface Conditioning Discs are made of nylon non-woven material impregnated with premium abrasive grain, and use a Type R - Male fastening system that gives the maximum strength to the sanding discs and helps to provide durable sanding with reliable and consistent performance to the user.. These discs are perfect for hard to reach surfaces and odd angles. Applications include: deburring, surface prep, gasket removal, coating removal, cleaning weld spatter, removing heat discoloration, blending and finishing, rust removal, etc. Pro-Graad Surface Conditioning Discs provide better surface conditioning performance, longer life, better anti-smear performance, less rework and significant cost savings. The discs are ideal for removing surface defects, edge burrs, parting lines or flashing, rust, oxides, corrosion, paint and scale, cleaning molds, blending mill marks, tool marks, uneven edges and refining coated abrasive finishes. The result is an innovative product that offers superior results and leaves perfectly finished, smear-free surfaces.