White Dog Screen Door (External Size 29cm x 24cm), Pet Screen Door with Lock for Dogs and Puppies, Dog Door for Screen Door 4 WAY SWITCHING MODE --- The cat flap can be set via the tab switches on the door to 4 modes: exit only, entry only, entry and exit and fully locked entry and exit control of your pet. DIMENSIONS AND APPLICATION --- External dimensions: 24cm x 29cm x 1cm (W x H x D), Internal dimensions: 31cm x 37cm (W x H), suitable for small, medium and large dogs and cats with a waist circumference of less than 19.24cm. AUTO LOCKING AND LOCKING --- Pet door with magnetic flap closure, the built-in magnet can keep the door closed automatically when your cat or dog goes out. EASY TO INSTALL --- Full instructions are included allowing you to easily install it on doors , panels and patios or any other area of the screen etc. EXCELLENT QUALITY --- The frame of our cat flap is made of high quality ABS material, the wire of the net is made of expensive materials, and it is strong and durable.