Give your dog or cat the complete freedom you both deserve to go inside and out. Install the PetSafe Freedom Aluminum Pet Door in your home. Fits standard doors 0.375 to 2 inches thick. Solid aluminum frame includes a closing panel that locks to provide extra security. Flexible transparent panel is easy for your pet to push through, so it can go in and out as it pleases. Panel is soft to prevent any injury. It also protects the inside of your home from insects and drafts. For pets up to 40 pounds. Measures 12.75 x 17.5 inches. Complete assembly instructions included.