4 WAY LOCKING: Our cat flaps with knob-style locks offer 4-way modes: open, locked, in-only (cat can enter but not exit) and out-only (cat can exit but not enter), to control pets in and out of your home^ SUITBLE FOR ALL DOOR - Included sliding door, glass door windows, panels and patio or any other screen areas, allow your pets freedom to get in/out. EASY TO INSTALL: Pet gate is easy to install on all surfaces including wood, brick, and PVC doors Durable Materials: Pet flap is made from high-quality PET, weather-resistant, sturdy, long lasting; Robust UV Polyethylene terephthalate construction ensures a virtually unbreakable Cat door FIT CATS AND SMALL DOGS: The frame is 9" x 8"; Our small dog door suits all breeds of cats and some small dogs up to 8kg / 17.6lbs