Strong structural foam plastic frame designed for installation in walls from 4-1/4” to 9-1/4” thick Double, flexible clear vinyl flaps create an "air lock" for maximum insulation and energy efficiency Comes complete, including all hardware, template, and detailed easy-to-follow instructions. No additional parts or wall kit needed! Animal lock-out slide included Installs easily into all types of interior and exterior walls including drywall, plaster, wood, aluminum or vinyl siding, stucco, brick and even concrete.