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These unique abrasive wheels are ideal for de-burring, blending and finishing on harder metals like stainless steel, carbon steel and high nickel alloys. Scotch Brite™ Unitized wheels combine nylon fibers and a high concentration of aluminum mineral to provide superior results throughout the life of the wheel. Its 'open web' design runs cool, improves performance and limits clogging of the fibers. Wheel size: 3" x 3/4" with 1/4" center hole; maximum operating speed is 15,100 rpm.