Chief Mfg.Projector Hardware Mount Black (PG1AW) Directly compatible with rpa and RPM, Projector mounts Also attaches to 1" and 1.5" NPT diameter Poles for use with rsm, & rsa Projector mounts Fully encloses Projectors in a locked steel cage to protect from theft or recreational damage Saves unnecessary costs and hassles caused by Projector mount theft Mount with pre-existing installations without disturbing Projector settings