Strong Aluminum frame that adapts to doors ranging from 1/2 to 1-3/4 in thickness. Clear vinyl flap with patented edges that won’t warp from use or extreme temperatures. Spring loaded Lockout slide to keep your Ideal Pet out of mischief when unsupervised. For pets 36 - 90 lbs. Flap size 10.5 x 15 Cutout size 11.25 x 17.5 Door thickness range 0.5 - 1.75