Multiple Holes: The design without down provides highly efficient dust removal, resulting in cleaner air, better finishes and a longer pad and abrasive life. And compatible with most 6-inch sanding discs. Medial Pad: The increased rigidity of this central pad helps keep more sanding disc in contact with flat surfaces and narrow edges, perfect for sanding between coatings, fine sanding and lacquer repair work. It gives better performance and flatter finish. Higher Efficiency: Use drill and riveted aluminum drive plate and fiberglass reinforced heat-resistant backing plate, reduces vibration and bamboo, providing stability and extending the useful life of the pad. Hook & Loop: Hook and loop (uniform arrangement, high density, good viscosity) for fast and efficient abrasive changes, provide carpenters and other users for consistent finishing results and uniform use.