Size: external frame of pet mosquito net: 37 cm x 42 cm; internal frame: 31 cm x 36 cm; suitable for medium/large pets Provide an independent passage for your pet: there is a magnet at the bottom of the door frame, and the pet mosquito net door can automatically close after the pet passes through the door. Two sliding locks The bottom of the flap helps to lock the mosquito net door of the dog and ensure that the pet stays at home unattended Material: Made of high-quality, safe, non-toxic and durable ABS material Easy to install: there are shielded doors or windows; According to the size of your dog, install the pet mosquito net door at a proper position and fix it with screws. explain Included in the product packaging Suggestion: When inserting the inner flap into the outer frame, please bend it slightly. Teach your pet to go in and out through the mosquito net door