DESC: For pets under 30 Lbs. - Rustproof, strong ABS frame - Works with metal or fiber screen doors - Easy to install - Panel has locks to keep pets from going out - Ceramic magnets ensure flaps always closes completely behind your pet - Opening is 8 In. x 10 In. - Easy to follow installation manual - Can also be installed in screened windows between kitchen and patio as a food and drink pass through Tools and Hardware