Designed specifically for IRIS" 4-panel Indoor/Outdoor Pet Pen, this 2-panel expansion kit will create a 6-panel pen measuring 61-inch by 61-inch by 24-inch H. The pen can be arranged in multiple different shapes to fit your pet"s needs and available space. Assembles or disassembles in seconds. Made of durable, heavy-duty molded plastic, and will not rust.