Fiber Disc, Abrasive Type Coated, Abrasive Material Ceramic, Backing Material Fiber, Backing Weight Not Applicable, Grit 50, Overall Diameter 4 1/2 in, Series BlazeX F970, Maximum Operating Speed 11,000 RPM, Resistance Properties Tear, Connector Size 7/8 in, Connector Type Unthreaded Hole, Color Orange, Grade Coarse