Perfect Pet ThermoPlastic Pet Door - ThermoPlastic pet door features inner telescoping frame that adapts to doors of 1-1/4 In. to 2 In. thickness. Includes impact resistant super-strong thermoplastic, clear vinyl flap with patented edges won't warp from use or extreme temperatures, and floating bottom threshold for perfect seal. Lock-out slide keeps pet out of mischief when unsupervised. Features tamper-proof mounting so the door cannot be removed from outside. Easy installation - average installation time is 20 minutes. 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. - Opening Size: 5 In. x 7 In, Pet Size: 2 to 12 Lb, Material: Thermoplastic, Color: White, Lockable: Yes, Thickness: 1-1/4 In. to 2 In, Cut Out Dimensions: 6-1/4 In. x 9-1/2 In, Pkg Qty: 1, Package Type: Box.