Stop feeling guilty about leaving your pet at home and give them the freedom to come and go as they please. The large Super Tough Pet Door with tunnel can be used for dogs up to 100 pounds. The outer frame measures 20.47" x 15.16". The clear plastic door measures 16.54" x 11.22" with a virtually unbreakable polycarbonate flap suitable for even the most energetic dogs. This pet door is uniquely designed for doors screens and walls up to 2.17 inches thick to allow your four-legged friend the freedom he or she needs for happiness and health. The two way controlled access allows your pet open access with magnetic centering flap to ensure the door shuts after each use keeping out drafts and weather. You can also change the access to locked keeping your pet inside or out. Hakuna Pets is a dedicated pet care company specializing in independence and safety technology to improve the lives of pets and their people.