Our pre-formed faux pillars are designed to enhance existing fences and new installations. All posts are 12" x 12" x 64" tall and can be buried for shorter applications. When setting elevation, it is important to establish the height by the finished concrete elevation in the initial hole. The Rock Post is slid over the pre-installed 4x4 or 5x5 post and secured into place by putting additional concrete or gravel inside the Rock Post. For corner posts, gate post, mail box, or signs, the entire Rock Post may be filled with concrete. Cutting the Rock Post for vinyl, split rail, log, etc. is simple!! By using a holesaw, router, or jigsaw, holes can be cut through the 1/4" wall to receive any configuration. The simulated concrete cap is removable and is designed to accept different lighting applications.