Material: PC Convenient Lockout — The rotary switch is a 4-way rotary, you can easily rotate it to 4 modes using the arrows and icons to control your cat’s access options: in only, out only, free in and out, fully locked . Improved Weatherproof Wiper Strip — It provides a retaining slot with a snap for the weatherproof wiper strip to securely hold the brush strip. Even if the brush strip falls off, it can be easily put back into the retaining slot. This greatly helps the brush strip reduce noise and keep pests such as raindrops, wind or mosquitoes to a minimum. EASY INSTALLATION — Pay attention and prepare necessary tools for easy installation according to your needs. The tunnel depth can be reduced according to your installation needs. Suitable for — Size: 30304CM. Suitable for installation on interior doors, exterior doors, walls, windows, cabinets, glass, ETC. Product outer size: 30304CM Inner size: 18.5*20.5cm Small recommended hole size: 26.7cm round hole diameter