Size: passage through opening: 6.89 x 6.89 x 1.38 inches, outer size: 10.55 x 9.05 x 2.17 inches Prepare a house warm for stray animals in the cold night Do you have a lively kitten? cat fish Cat door for cats under 30 lbs. This patented and patent pending cat litter door makes it easy to touch Katzbet’s litter box. It can also be installed in the garage to help stray cats survive the cold night. Our advantage: This ingenious cat cross is ideal for bedrooms, bathrooms, laundry rooms, basements , mud rooms, closets and more. Perfect for high performance breeds like Maine Coon, Birman, Bengal Cat, American Bodail and Ragdoll. Easier to install. Encourage intricate pus holes that require messy glue, pins and tapes. Your iCuso cat flap is easy to install in just 15-20 minutes. Just screw on both sides, screw on top and you’re done. All hardware included. More secure than most. Little wasted time with the lint remover glue. This sturdy cat door will never tear out of its interior door.