Use the Pet Gate Extension Kit – 10.5 inches with three pet gates available on this website. The gates are the Stairway Special Pet Gate – Outdoors (model 52250), the Stairway Special Gate – Indoors (model SS-30), and the Auto Lock Attached Pet Gate (model MG-15/B). All sold separately. Use this extension with one of these gates for openings 40 1/2 inches to 50 1/2 inches. The weight is 4 pounds.