PetSafe Cat Flap Pefect solution to give your cat access to the litter box or food through any interior door, while helping keep the dog or kids out Simple installation with detailed instructions, cutting template and hardware included 2-way slide lock to open flap or close flap to keep your cat from using the cat door High-impact, white plastic frame with a transparent, hard flap that cats prefer for comfort and ease of use For installation only in interior doors 1/2" to 2" thick For small cats or dogs 15 lbs. or less; flap opening size 5 3/4" W x 5 3/4" H Call, chat or email with our expert US-based customer care specialists six days a week; they are waiting to assist you and your pet with your product needs PetSafe Brand is an industry leading US manufacturer of pet behavior, containment, and lifestyle products since 1991, helping millions of people and pets each year