The RPA is the top-selling projector mount in the industry! More RPA Series Mounts are installed in offices schools and homes than any other mount. Independent roll pitch and yaw for quick and precise projector registration Quick connect/disconnect for convenient lamp and filter access on most projectors Maintains registration when disconnected and doesn't affect preset adjustments All-Points Security exclusive steel-into-steel locking hardware at all key connection points to protect against theft Multiple installation options: flush mount to ceiling mount with 0.25"" threaded rods or mount with 1.5"" NPT threaded extension column Cable management without additional accessories