Sanding Disc Backup Pad, Abrasive Mount Type Hook and Loop, Abrasive Mounting Quick Change System Not Applicable, Connector Size Not Applicable, Connector Type Threaded Hole, Backup Pad Shape Square, Device Material Not Applicable, Density Not Applicable, Maximum Operating Speed 14,000 OPM, Number of Vacuum Holes 8, Color Black, Overall Length 1/4 in, Overall Width 4 9/16 in, Overall Diameter Not Applicable, Overall Thickness Not Applicable, Product Type Disc Backup Pad