This sander pad is compatible with the Ryobi random orbit sander listed below. It is genuine Ryobi replacement part. The pad features a durable foam body attached to a hard plastic backing plate. It is a five inch diameter pad with a hook-and-loop style underside for use with Hook and Loop type sandpaper. This pad has eight vacuum holes. COMPATIBLE WITH: - RS290 Random Orbit Sander - RS290G Random Orbit Sander - P411 Random Orbit Sander - Craftsman 315.1112170 random orbit sander