PE0156 Features: * For use with Peerless Vector Pro or PJRL30 LCD projector mounts. * Reduces unwanted vibrations by absorbing abrupt shocks that may cause internal damage to the equipment. * Accepts Peerless EXT and ADJ extension columns. * Pre-assembled. * Features cord management access holes. Dimensions: * Base that attaches to ceiling is 11.2""L X 4.6""W.