It appears I received 2 different pens - panels were different sizes and don't seem as though they belong together. We didn't receive enough hardware to fully set it up, so ended up having to use zip ties to keep panels together. It didn't come with a lock for the opening gate, so we had to get our own. Material isn't sturdy and is on the cheaper side, definitely not what was expected for $500+...contacted the vendor about all of this and no one got back to me - in the process of looking for a better pen to replace this, but right now I need it, so unfortunately I'm unable to return it.