Way Lockable Dog & Cat Door, Pet Gate Allows Free Access in Both Directions, Flap Pet Gate Door

Size:XL Outside size: height 10.91in* width 9.84in* thickness 2.17in Inner size: height 8.66in* width 7.87in Size:L Outside size: height 9.84in* width 9.25in* thickness 2.09in Inner size: height 7.48in* width 7.09in Size:M Outside size: height 7.76in* width 7.48in* thickness 2.09in Inner size: height 6.3in* width 6.18in Size:S Outer size: height 7.76in* width 7.48in* thickness 0.79in(suitable for installing glass doors and windows) Inner size: height 6.3in* width 6.18in Tips: The product screws are uniformly distributed in the factory, because the thickness of each door will definitely be different. If the screws are not suitable for installation, you need to purchase them separately, please know! The size of the other large and medium size can be thinned. If the thickness of the door is less than 5cm, please cut it thinly with scissors and mark it with a scale!!! In addition, the small size cat door has only four screw holes on the main panel, and the rear panel has no screw holes. Because this trumpet is mainly installed on the glass door and window, it needs to be glued. The glue needs to be purchased by itself. Just to make it look good!!! 4 ways to set : not to enter (completely closed) / can be entered (completely open) / can only enter / only out Regarding the size standard of the opening when installing: the large opening height is 21.5cm and the width is 19.5cm. the medium and small opening height is 17.5cm and the width is 16.5cm. in addition, if the glass is installed, it can be opened again, as long as it is smaller than the cat. The outer dimensions of the door are OK, because there is no need to make screw holes on the mounting glass, and directly glue the glass glue or super glue!