I can't find the one we used but it is similar to this:
http://www.walmart.com/ip/Evenflo-Ea...ndingMethod=rr
We had one that was attached to the wall on one side and pressure mounted on the other side. It could swing open and closed with a handle on the top. Mine were not climbers so I didn't have to deal with that. We also mounted it a little bit off the ground so that it was higher up and they couldn't try to hang off of it. We used it in the kitchen.