Perfect Pet Soft Flap Cat Door with Telescoping Frame Inner telescoping frame that adapts to doors of 1/14-inch to 2-inch thickness Tamper proof mounting system, pet door cannot be removed from outside Impact-resisting super-strong thermoplastic clear flap allows pet to see if slide is in place Simple 4-step installation, average install time: 20 minutes) Flap size: 7-inch by 11 1/4-inch Manufacturer Warranty does not apply to product purchased through Amazon Warehouse Deals Need Assistance? E-mail Ideal Pet Products expert US-based customer care specialists seven days a week!