Wall Entry Kit SmartDoor Kit allows for easy installation of the Small PetSafe Electronic SmartDoor in any interior or exterior wall up to 7 1/4" thick Telescoping design allows for quick installation by framing wall cut-out Durable, impact-resistant and UV-resistant 2 piece frame with protective outer lip to help keep out weather and drafts Kit includes interior frame, exterior frame, installation hardware, cutting template and detailed installation instructions For installation in interior or exterior walls 4 3/4" to 7 1/4" thick 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