This door gives your pet all the independence he needs. Easy to install, the solid aluminum frame has reinforced corners for heavy use or for multiple pet homes. The flexible, soft flap is tinted and adjustable. A magnetic flap closure and pile weather stripping along the sides of the flap opening form a weather-resistant seal. A closing panel is included for improved weather-resistance or to control your pet's access to the pet door. Fits doors from 3/8" to 2" thick. Outside frame dimensions: 12-3/4"x 19-5/8". Flap opening dimensions: 10-1/4" x 16-1/4". Cut out size: 10-7/8" x 17-7/8". Great for pets up to 100lbs.