PetSafe Staywell Aluminium Pet Door allows your dog or cat to enter and exit as he or she wishes. The metal frame with reinforced aluminium corners makes the pet door extra sturdy and durable.The magnetic tinted flap, weather cover and sliding closure panel provide protection against drafts and possible cold scratches. You can also use the sliding closure panel to "lock" the door for entry and exit.Installation is smooth and easy and fits doors up to 5 cm thick.Facts about PetSafe Staywell Aluminium Pet Door:Hatch with metal frame and reinforced aluminium corners.Magnetic closure.Sliding closure panel.Fits a door with a thickness of up to 5 cm.Available in four different sizes.