For anyone working with angle grinders or polishing tools, this Superior Diamond Tools rubber backer pad is an essential accessory! The 4-inch diameter is perfect for most standard polishing and sanding applications, and the 5/8-11 arbor fits most common angle grinders perfectly. The rubber construction provides just the right amount of flexibility for contouring to surfaces while maintaining stability during operation. The hook and loop backing system makes changing sanding discs or polishing pads quick and easy - no more struggling with adhesive backups or complicated mounting systems. The heavy-duty build quality means this backer pad can handle professional use without deteriorating quickly. Whether you're working on automotive polishing, wood sanding, metal finishing, or any project that requires smooth, consistent pressure distribution, this rubber pad delivers reliable performance. The flexibility allows you to work on curved surfaces without creating flat spots, while the sturdy construction prevents wobbling or uneven pressure. It's compatible with all standard hook and loop sanding discs and polishing pads, making it a versatile addition to your tool collection. The quality is professional-grade - the rubber maintains its properties through extended use, the arbor connection is secure, and the hook and loop surface stays effective through multiple pad changes. If you're tired of cheap backer pads that wear out quickly or don't provide consistent results, investing in a quality rubber pad like this can seriously improve your finishing work and make your sanding and polishing tasks much more efficient and professional-looking.