Medium Aluminum Pet Door

Heavy-duty aluminum frame withstands stress from even the most powerful breeds - Soft, transparent, single flap for maximum efficiency - Insulated, locking, rustproof closing cover has a locking pin and is the strongest and most secure available - Telescoping adjustable frame creates its own protective inner frame in doors from 1/16 In. to 2 In., may also be installed in wall but additional framing is required. For pets up to 40 Lbs. - Flap size is 8 In. x 11 In.