FC 3173 Sand Box Seat is smooth, comfortable and contoured and makes the perfect surface to enjoy playset sandbox. Smooth, sturdy, comfortable 18 1/2" contoured seat for Sandbox eliminates the need for angle cut boards and any potential splinters. Includes two small holes to drain standing water. Approximately 7" wide x 5" deep. PlayStar's sand box seats should be able to be used on any wooden playset structure that does not have the posts on the inside of the frame.No hardware or Instructions included.