• Backing Pad For Mounting Semi-Flexible or Sanding Discs • 5/8”-11 threaded arbor for spin-on mounting.Flexovit Backup pads and Accessories are of the highest quality and available in different threads & configurations to fit most machinesFor Use With Resin Fiber or Semi-Flexible Sanding DiscsFor Use On Angle Grinder to Mount Sanding or Masonry Discs