Ideal Pet Products Aluminum Sash Pet Door Medium White 1.63" x 33" x 16.63"

For pets 13 - 35 lbs. Flap size 7" x 11.25" Adjustable width from 33" - 38"You may also like Ideal Pet Products Screen Guard Dog Door, White, X-Large, 1.25"L x 13.62"W x 19"H.