"Type 27 Raised Hub. Made for a wide range of grinding, shaping and cutting jobs in home workshops, farms, and machine shops. Aluminum oxide is recommended for all types of ferrous metals. Wheel dimensions are diameter x thickness x arbor. Wheel Diameter in. 4 1/2, Max. RPM 12,000, Wheel Type Concrete and masonry grinding wheel, Arbor Size in. 7/8, Wheel Thickness in. 1/4, Wheels qty. 1."
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