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.) 7 Wheel Thickness (in.) 1/4 Arbor Size (in.) 5/8 Thread Size 11 Max. RPM 8,500 Wheels (qty.) 1 Recommended Use Masonry