Pet door that features inner telescoping frame that adapts to doors of 1/2 In. to 1-3/4 In. thickness. Includes high-quality aluminum construction, and a clear flap to allow pet to see if slide isn't in place. Features tamper-proof mounting so that the door can't be removed from outside and a Thermo-Insulated lockout slide. Installation measurements is the opening you cut in the door to install. How to select the right pet door: Step 1: Measure your pet from the top of the shoulders to the chest, just behind the front legs. Step 2: Determine your pet's weight. Step 3: Select the correct door size based on your pet's measurements and weight. No. DPDM: Opening Size: 7 In. x 11-1/4 In., Pet Size: 13 to 35 Lb., Material: Aluminum, Color: White, Lockable: Yes, Thickness: 1/2 In. to 1-3/4 In., Cut Out Dimensions: 7-9/16 In. x 13-3/4 In., Pkg Qty: 1, Package Type: Box No. DPDXL: Opening Size: 10-1/2 In. x 15 In., Pet Size: 36 to 90 Lb., Material: Aluminum, Color: White, Lockable: Yes, Thickness: 1/2 In. to 1-3/4 In., Cut Out Dimensions: 11 In. x 17-3/16 In., Pkg Qty: 1, Package Type: Box No. DPDSL: Opening Size: 15 In. x 20 In., Pet Size: 91 to 120 Lb., Material: Aluminum, Color: White, Lockable: Yes, Thickness: 1/2 In. to 1-3/4 In., Cut Out Dimensions: 16 In. x 21-5/8 In., Pkg Qty: 1, Package Type: Box
