Fiber Disc Backup Pad, Abrasive Mounting Quick Change System Not Applicable, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Backup Pad Shape Round, Device Material Rubber, Density Soft, Maximum Operating Speed 12,000 RPM, Number of Vacuum Holes Non-Vacuum, Overall Width 4 1/2 in, Overall Diameter 4 1/2 in, Product Type Disc Backup Pad