Product Details Use the JobSmart 115 mm A60 Grit Metal Flap Disc Wheels to grind down metals. Featuring a fiberglass backing plate, these grinding discs remain rigid under pressure. They also feature overlapping cloth-backed flaps that flex for contour work. There are 8 total grinding wheels included. Satisfaction guaranteed. Excellent for grinding metals Durable overlapping cloth-backed flaps flex for contour workThe fiberglass backing plate provides rigidity under pressure Rated for 13,300 RPM (80 m/s) Set of 8 A60 metal flap disc wheels 7/8 in. arbor Dimensions of the grinding discs: 7/8 in. (22.23 mm), 4-1/2 in. (115 mm)