Features & details FREEDOM AND INDEPENDENCE: Give your cats and dogs freedom to go in and out without your help, arrangement for potty breaks or play time by themselves. DIMENSION AND TELESCOPING WIDTH: The telescoping tunnel accommodates walls that are 4 3/4 - 7 1/4 in thick.Flap Opening: 8 1/4"W x 12 1/4"H. Frame: 12 1/4"W x 17 1/8"H. Cutout in wall:9 7/8"W x 13 3/4"H. EASY INSTALLATION: This pet door easily installed in all types of interior and exterior walls; cut-out template and step-by-step instructions are included, simple to follow instructions walk you through the install. DURABLE, SAFE :This Pet Door frame is made of metal laser welding process and high-quality steel aluminum alloy oxidation to ensure durability,security and thermal insulation. ENERGY-SAVING: The double-flap provides weatherproofing and energy efficiency and helps protect against extreme weather, air drafts. TAILORED FOR YOUR PET : Flap opening is 8 1/4" W x 12 1/4" H and is designed for pets up to 40 pounds. AFTER-SALES GUARANTEE: Baboni is a new brand and growing fast. Complete accessories. Customer satisfaction is our pride. We committed to providing customers with high-quality products and after-sales service. Your pet will love this door.