Sold separately, the additional two panels increase the size of the 3-in-1 Metal Superyard from 10 square feet to 19 square feet! Adds an additional 48 when used as a barrier. Want to increase the size even larger? Just add another Two-Panel Extension. Unlimited Two-Panel Extensions may be used. Width: 2 panels of 24 Height: 30 Bar spacing: 2 Mounting options: free standing or wall mounted