The steel pet gate works very well. These products are well made and will last for years. I used the extensions on both sides of the gate. Installation is easier if you use cable ties to temporarily secure the extensions to the gate, as only the pressure from the installed gate keeps them from coming loose. The plastic extensions required some force to insert. The installed gate is sturdy and secure. Since there are only vertical bars, my puppy cannot climb the gate. It's a great improvement over the plastic baby gate that it has replaced.