Hook-and-Loop Disc Backup Pad Abrasive Mount Type Hook and Loop 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 Medium Maximum Operating Speed 13 000 RPM Number of Vacuum Holes Non-Vacuum Color Black Overall Length Not Applicable Overall Width 4 in Overall Diameter 4 in Overall Thickness 1/2 in Product Type Disc Backup Pad