The PFERD 69470 Combiclick Backing Pad is a high-quality, durable backing pad designed for use with 4-1/2 to 5 inch grinding wheels. With a 5/8-11 arbor size, this black backing pad is compatible with various light equipment and tools in the business and industrial sector. The PFERD brand is known for its reliable and efficient products, making this backing pad a valuable addition to any workshop or job site. B3