This light-weight pet flap doorwith high quality lock sheet allows you to install a exclusive door into an interior or exterior wall,after your pet passing through the door, it will get closed automatically.Size: S = 29 cm 24 cm or L = 42 cm 37 cm. HIGH QUALITY AND DURABLEMade of high quality ABS material that solid and durable. Easy to fit, high temperature resistant, not easy to deform.Screws reinforcement makes our pet screen door sturdy enough and never easily fell apart. It can last for long time. 4 SWITCHES MODELFour independent models to lock the cat flap door with switches - - swing out only, in only, both in and out, and fully locked, easy to control your pet's in and out. Easy to Install and UseOur dog screen door is easy to install. You can install it by your own. It's also easy for your beloved pets to push or close.Lightweight Flap,your dog will not feel heavy.Suitable for all doors, windows, panels or any other screen area. VersatileIt blocks mosquitoes, flies, insects and filters out dust and debris. Make your home more ventilated and reduce the smell of pets. It is suitable for all pets up to small or medium size dogs.