GenStone offers two options. The first option is four of our 90-degree corners that are designed to fit a 17” column, giving a finished measurement of about 19”. These corner pieces are 2' tall. The second option is our pillar panel system. Pillar panels are made to fit around an 8” post with an outside dimension of 11”. Each pillar panel is 48”. Four panels would be needed to wrap your post. With either option, you may stack GenStone to reach your desired height.