Rex-Cut Megabrite T27 Finishing Flap Discs are layered with non-woven synthetic fiber surface conditioning materials to expose fresh material as they wear and provide smooth, controlled grinding action. Suitable for cleaning, deburring, blending and finishing stainless steel, aluminum and other metals, the discs provide optimum performance with minimum heat at 6,000RPM, and are available in 4-1/2" and 5" diameter sizes with 7/8" holes or 5/8-11 adapters; with or without hubs. Designed for use in right angle grinders, discs come in industry standard color-coded coarse, medium, and very fine grades.