4 x 4 CAPS   4 x 4 Fence Caps Post Finals 4 x 4 Companion Pieces Capstone offers a wide variety of styles of post finials and matching companion pieces for decorating your fence or railing project. There are two fence post caps, the Spire and Acorn, which are designed to fit larger, rough wood 4"x4" posts. Inside dimensions are 3-3/4" x 3-3/4". These two caps are more suitable for perimeter fencing. All other post finials, the Ball, Palm, Leaf and Pyramid styles and their matching companion pieces are available as post caps or post pegs. Interior dimensions of the 4 x 4 caps measure 3-1/2" x 3-1/2". All finial styles and matching companion pieces are available in this post cap style for mounting. The cap is sized to fit over smooth, finished 4"x4" posts. All finial styles and matching companion pieces are available in this post peg style for mounting. The peg is designed to fit on a range of post sizes and requires an 1-5/8" hole for mounting. 6 x 6 CAPS The 6 x 6 caps come in four styles, Pyramid, Pyramid Companion, Ball and Grape. Overall the caps measure 7-1/2" x 7-1/2" at the widest point. They're sized to fit over finished 6 x 6 timber and have an interior dimension of 5-1/2" x 5-1/2".