A video tour of an Ideal Pet Original Plastic Pet Door. www.idealpetproducts.com We’ve developed a sturdy thermoplastic (ABS) frame; a see through poly vinyl flap with patented edges designed not to warp; a floating sill to insure good closure; and a molded ABS lock-out slide to restrict the pets’ movements when necessary. They come in four sizes for pets up to 120pounds. And with a tamper proof mounting system and easy installation, it’s the most economical pet door in the industry. Features Include * Inner telescoping frame that adapts to doors of 1 1/4″ to 1 3/4″ thickness. * Impact-resistant super-strong thermoplastic. Clear flap allows pet to see if slide is in place. * Tamper Proof Mounting System, door can’t be removed from outside. * Simple 4-step installation. (Average install time: 20 minutes) * Floating bottom threshold for perfect seal every time.