"So quick and easy to set up and take down, the Jewett Cameron Lucky Dog Exercise Pen is a perfect pet tool for at home, travel or training. No tools are needed to set up this indoor/ourdoor, eight-panel space and its collapsible sturdy-wire construction and handle make it easy to transport. Rust-resistant E-coating finish adds lasting durability. One panel features a double-latch gate for easy entrance and exit. Made for dogs but perfect for many kinds of pets. Super-quick setup and takedown No tools needed to set up this indoor/ourdoor space Sturdy-wire construction collapses for easy transport Rust-resistant E-coating finish adds lasting durability Double-latch gate makes pets entrance and exit easy 24"" Pen Panels measure: 24""H x 24""W. Door opening: 17.75""H x 14.25""W. 36"" Pen Panels measure: 36""H x 24""W. Door opening: 29.75""H x 14.25""W. 48"" Pen Panels measure: 48""H x 24""W. Door opening: 41.75""H x 14.25""W."