Ideal Pet Products Deluxe Pet Door - Extra Large Extra Large Ideal Deluxe Pet Door Dimensions: Flap Size: 10 1/2" x 15", External Frame: 12 3/4" x 18 5/8", Rough Cut: 11 1/4" x 17 1/2", Recommended for pets up to 90 lbs. Inner telescoping frame adapts to all hollow core and solid doors of 1/2" to 1 3/4" thickness. No need to build an inner frame. High quality aluminum construction (White). Thermo-Insulated Lockout Slide. Tamper Proof Mounting System, door can't be removed from outside. Clear flap allows your pet to see if the slide is in place.