Aluminum backer pad with an angled edge for precise and accurate polishing.For use with any Grip (Hook and Loop)Buffing or Polishing Pads that allow This Backing Plate.Allows quick and easy pad changes.Aluminum backer pads used for connection of air polisher and polishing pads. It can be fit with 5/8-11 thread. It is rigid and with velcro back. It is light and can be used for a long time. A good choice of rigid backer pads.