One panel in this set of 8 Steel Panels starts off at a mere 36" x 29". It then EXPANDS to 5 ft. wide x 4 ft. tall, forming a 10 ft. x 10 ft. square corral. This is the same size as a standard box stall. It is also the same size of most pop-up canopies. The panels can be easily rounded out as shown if you like a 13 ft. round pen.
 

The (3) powder-coated steel brackets are designed to be bolted to your trailer (requires drilling), then a corral panel can be attached using the same drop-pins that come with the corral system. Bracket Set includes one additional Drop Pin.