Features: Ensure the security and control over your movements with thin pet door. ABS material, this pet features system for added security and control over your movements. For cat and small seek to give their the to come and go as they please while maintaining safety. Perfect for use in various such as livingrooms, balconies, outdoor camping, and travel to ensure your stay safety and secure. Just fixed by screw to prevent from wind coming. Suitable for every door, panel/ any other area. Specifications: Material: ABS Size: Small: Outside Diameter: 28x34cm/ 11.02x13.39in, Inner Diameter: 22x28cm/ 8.66x11.02in, Width: 4.50cm/ 1.77in Large: Outside Diameter: 35.8x43cm/ 14.09x16.93in, Inner Diameter: 30x37cm/ 11.81x14.57in, Width: 4.50cm/ 1.77in Package Includes: 1pc Pet Door note: 1: Please allow 1-2cm errors due to manual measurement, ensure that you not mind before your order. 2: Due to the differences between different monitors, the picture may not reflect the item's actual color.