4-Way Locking: Our cat flap with knob lock offers 4-way modes: Open, Locked, In-Only (cats can enter but not exit) and Out-Only (cats can exit but not enter) to control pets' entry and exit from your home

Fits all doors - including sliding doors, glass doors and windows, panels and patios or other screen areas, allowing your pets to come and go freely

Easy to install: Pet flaps are easy to install on all surfaces, including wood, brick and PVC doors

Durable material: Pet flaps are made of high-quality PET, which is weather-resistant, strong and durable

Robust UV polyethylene terephthalate construction ensures the door is virtually unbreakable

Outer door frame size: 19*19.7*5.3cm

Inner door frame size: 16*15.7cm

Installation method:

Tools needed: Electric drill, iron saw or chainsaw, tape measure

Step 1: Use a paper to draw the size of the door cover (there may be a few millimeters error)

Step 2: Draw the drawing on the door and draw it with a pen

Step 3: Use a drill to drill a hole in each of the four corners of the drawn door, and then start digging directly if there is a chainsaw

Step 4: If it is a glass door, use a glass cutting tool to carefully open it and fix it with glass glue

Step 5: The hole is cleaned, now make a layer of wood veneer to wrap around the hole, for beauty's sake

Step 6: Install the cat flap, there are accessory screws, screw it in with a screwdriver

Step 7: The screw port is also equipped with a screw cap, press it, OK and it's done!