Description: Quality Material: This pet door is made of ABS andbreathable nylon mesh, with smooth surface, can withstand thousands of swings for long time use, lightweight and anti collision.four lock Modes: The cat door 4 modes can be set in 4 ways locking, out only, in only, in and out(Fully open)and No in & No out(Fully locked), easy to control pet in and out. Size: This cat dog flap door is for both cats and small dogs, with 29cm/11.42inch outer diameter, 22cm/8.66inch inner diameter, 1cm/0.39inch thickness. Pet door featuring a silent opening and closing mechanism. Easy To Install: This small pets door closer is easy to install, 8 specially screws and nuts for better fixation and firmness.Wide Applications: This charming cats door is suitable for interior doors, exterior doors, walls, window and cupboards, etc. Specification: Material: ABS Size Chart: Outer diameter: 29cm/11.42inchInner diameter: 22cm/8.66inchThickness: 1cm/0.39inch Package Includes: 1 Pet Door with8pcs Screws Note: Please allow slightly errors 1-2cm differences due to manual measurement.