"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, Wheel Thickness (in.): 1/4, Arbor Size (in.): 3/8, Max. RPM: 13,500, Wheels (qty.): 1, Wheel Type: Type 27, Recommended Use: Metal"
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