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 Hard Maximum Operating Speed 8 600 RPM Number of Vacuum Holes Non-Vacuum Color Black Overall Length Not Applicable Overall Width 7 in Overall Diameter 7 in Overall Thickness 1/4 in Product Type Disc Backup Pad