Onyx: Slatestone 30" Column Wrap: 30" tall, 1 3/4" thick: 16" X 16" outside dimensions: one 4 piece column wrap per boxProduct Description: The Onyx Slatestone 30 Column Wrap gives existing posts a finished stone look without any hassle of real masonry. Each set includes four interlocking pieces that fit together using a patented groove system, which creates a solid wrap around your column. Its designed to go over a box or post, not to stand on its own. The finished dimensions are 16 x 16 on the outside and just under 14 inside. Each wrap covers 30 inches in height