The Flex 289957 is a Velcro Backing Pad with 5/8 Adapter. The Backing Pad is soft and springy for uniform pressure distribution. The universal applications of the pad are for holding polishing accessories, with centering hole and centering tube. It has 5/8” adapter. Features: * Ideal for holding polishing accessories. * Soft and springy for uniform pressure distribution. What"s In the Box: * Flex 289957 Velcro Backing Pad with 5/8-Inch Adapter.