We are dedicated to researching pet supplies, this cat/puppy door made of quality ABS material, durable and sturdy sealing, great for wood/metal doors and walls like the interior/exterior window doors, cupboards, glass, garage door. Built magnetic into the door flap can keep automatically closing when your puppy or cat sliding door. This cat flap door shows 4 modes to locked by Red and Green tabs switch: freely access, only go in, only go out or fully locking, makes it easy to keep your pets going in or out. Inner door flap edge covers sealing brush strip, which eliminates noise from door closing, also keeps rain, wind, snow, fly from entering the home. Provided 8 long screws (2.36 inch) install into 4 holes from both sides to meet the requirement of different doors/walls thickness. The depth of the door tunnel also can be cut by scissor, saw or cutting machine according to the thickness of the door/wall. Double-sided stickers can assist door installation. Inside flap opening size:
