Got your hands full? Our easy-to-use Spring loaded Lockout slide can be set up using just one hand. Strong Aluminum Frame that adapts to doors ranging from 1-1/4” to 1 3/4" in thickness. Flap is made with durable dual pane LEXAN hard panels. Ultra-Flex Flap design creates air pocket for maximum energy efficiency and wind resistance. Spring loaded Lockout slide. to keep your Ideal Pet out of mischief when unsupervised.