Your animal will certainly enjoy to come and go at will. This door snaps directly onto your existing screen door or window for quick and simple setup. The high-impact ABS frame consists of a slide lock that will certainly give you to control your animal's gain access to.Step Your Animal: Animal's width: It is essential to include an inch or so, that way your animal will certainly not rub on the door as he or she travels through it. animal's height: Determine your animal's height by determining from the top of your animal's shoulders to your animal's belly or chest. Add two inches. Sizes info: Huge: out size: 23.5 x25.2 x5.5 cm (W x H X D)/ 9 x 9.8 x 2.1 inch; inner size ï¼š 19 x 18cm (H x W)/ 7.48 x 7.08 inch Medium: out size:19.2 x 22 x 5.5 cm (W x H X D)/ 7.48 x 8.66 x 2.1 inch; Inner size: 15.5 x 15cm/ 6.1 x 5.9 inch( H x W). There're four function of the dog door, 1. Closed. 2. Open. 3. In just. 4. Out just. Material: High grade fantastic quality ABS. Bundle: 1 x cat flap. 1 x user handbook. 8pcs x Screws. 8pcs x Plastic Core Cover. 1 x paste sticker label.