Fiber Disc, Abrasive Type Coated, Abrasive Material Ceramic, Backing Material Fiber, Backing Weight Not Applicable, Grit 120, Overall Diameter 4 1/2 in, Series BLITZ, Coating Coverage Closed, Maximum Operating Speed 13,300 RPM, Resistance Properties Heat, Connector Size 7/8 in, Connector Type Unthreaded Hole, Color Purple, Features Grinding Aid, Rigid Backing