When using your random orbit sander to apply finish or perform maintenance on your cast iron surfaces you run the risk of having the finish/cleaner of being sucked into its internal dust collection. Since this interface pad does not have any holes, your risk is minimized. Made of 1/4"-thick black rubber material that provides a firm backing between the sander's pad and the sanding disc. This interface pad will evenly distributes pressure to a workpiece, resulting in a finer, smoother and superior finish. It utilizes hook and loop and works with any 5" random orbit sander.