Cheif Model # RPA 020 Inverted Ceiling 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. 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.