115 x 7/8, fiberglass backing pad An open web of thick,strong synthetic fibers and extra coarse abrasive,bonded together by a smear-resistant adherive allows cleaning and conditioning of a multitude of materials,quickly and easily with little loading. Surface prep before coating are applied Surface prep before welding Cleaning and conditioning after welding. Blending and rapid removal of surface contaminants,while producing fine finishes. Faster material removal and more durable on edges. Hub available upon required,suitable for Right Angle Grinder