Fiber Disc Abrasive Type Coated Abrasive Material Ceramic Backing Material Fiber Backing Weight YY Grit 80 Overall Diameter 4 1/2 in Series Predator Coating Coverage Closed Maximum Operating Speed 11 000 RPM Resistance Properties Heat Connector Size 7/8 in Connector Type Unthreaded Hole Color Gray Features Self-Lubricating Grinding Aid Rigid Backing Grade Coarse Package Quantity 25