The Astro Pneumatic 4608H 6" PSA Backing Pad with Holes is a Dual Action Random Orbit Backing Pad for Car Detailing with a unique tapered 29-degree edge which offers excellent edge flexibility. This pad works with an angle DA Random Orbit Sander. Specifications: 5/16" - 24 UNF thread; Max. RPM: 10,000; Made of polyurethane; Weight: 0.26 lbs. (0.12kg).