PetSafe Aluminum Pet Door for Sale. Size large ~ ideal for dogs up to 100 lbs. The flap opening measures 10.13” wide by 15.75” tall. Purchased several years ago but never installed. Comes complete with original box, hard security cover, instructions plus template and all hardware & screws. Below is info from the manufacture… Give your pets the freedom they deserve. This strong, insulated pet door withstands stress from even the most powerful breeds. The soft, transparent single flap provides maximum efficiency and is equipped with a locking security cover. • Telescopes to fit doors from 3/8-inch to 2-inch thick. • Can be installed in wall with additional framing • Heavy-duty aluminum frame: Perfect for heavy use or multiple pet homes • Protect against weather & drafts: Magnetic flap closure, pile weather stripping and slide-in closing panel • Tinted vinyl flap: Flexible flap is designed for your pet’s comfort and ease of use • Easy installation: Includes detailed instructions, cutting template and installation hardware • Designed for large pets under 45 kg: Flap opening is 260 mm x 413 mm • Interior or exterior installation: Fits people doors between 1 cm to 5 cm thick • Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; they are waiting to assist you and your pet with your product needs. • PetSafe Brand has been an industry leading US manufacturer of pet behaviour, containment and lifestyle products since 1991, helping millions of people and pets each year To watch an informative video, please go to https://www.youtube.com/watch?v=0LTmV_dOmmo