Description:Product Material: ABS Material (Smooth Surface, Very Strong)4 Ways of Setting: Do Not Enter(Fully Closed)/Can Enter(Fully Open)/Can Only Enter/Only ExitSize: LComm: Height 25CM*Width 23.5CM*Thickness 5.5CMCinner Measure: Inner Height 19CM*Inside Door Side Width 18CMumpire: MRouter Dimension: Height 19.8CM*Width 19CM*Thickness 5.5CMCinner Measure: Height 15.5CM*Inside Door Side width 14.7CM Measurement: Outer Size: Height 19.8CM*Width 19CM*Thickness 1.8CM (Suitable for installing glass doors and windows)Inner Size: Height 15.5CM*Inside Door Width 14.7CM Indications:1. The screws of the product are evenly distributed in the factory, because the thickness of each door is bound to be different. If the screws are not suitable for installation, you need to buy them separately, please know! The size of other large and medium sizes can be diluted. If the thickness of the door is less than 5cm, please cut it thinly with scissors and mark it with a scale! ! ! Also, the small cat door has only four screw holes on the main panel, and the back panel has screwless holes. Since this trumpet is mainly installed on glass doors and windows, it needs to be glued. The glue must be purchased by yourself. To make it look good! ! !2. As for the standard of hole size during installation: the large hook is 21.5cm high and 19.5cm wide; 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 external dimensions of the door are ok because there is no need to make screw holes on the mounting glass and directly stick the glass glue or super glue! Packing List:1pc 4 way lockable pet door