The Alpha Rigid Backer Pad from Alpha Professional Tools is a high-quality rigid backing accessory designed to provide a flat, stable platform for attaching polishing pads, sandpaper, and felt wheels during wet polishing and finishing of stone surfaces. It is engineered to deliver smooth, distortion-free results on straight edges and flat areas, which can be difficult to polish evenly with flexible backer pads. Unlike flexible pads that can flex and create wavy finishes on flat surfaces, this rigid backer pad keeps the polishing abrasive perfectly flat against the stone. This results in a uniform polished surface and significantly reduces the risk of surface irregularities when working on edges, countertops, or large flat planes. Key Features Super Rigid Construction: Designed to stay flat and stable during polishing to prevent waviness and finish distortion on flat stone surfaces. Hook & Loop Backing: Accepts a wide range of polishing pads, sandpaper discs, and felt wheels for versatile use. Enhanced Control in Tight Areas: The rigid design enables work in smaller or hard-to-reach locations such as corners and staircases. Common Thread Compatibility: Typically available with a 5/8″-11 thread (and other thread options like M14 or M16 upon request) to fit most grinders, polishers, and angle tools. Multiple Sizes Available: Commonly offered in 3″, 4″, and 5″ diameters to suit different tools and job requirements.