Chief's RPA Series Inverted Ceiling Mount with the exclusive All-Points Security System is the top-selling projector mount in the industry! More RPA Series Mounts are installed in offices, schools and homes than any other mount. Why is the RPA so popular? Because it gives you everything you need for a quick installation, low-profile look and hassle-free projector maintenance. This product is designed for the following systems: A + K AstroBeam X240, AstroBeam X250; ASK C160, C180; ASK Proxima C160, C180; Boxlight CP-325m; Dukane ImagePro 8758, ImagePro 8772; InFocus LP540, LP640, Screenplay 5000; Proxima C160.