PERFECT DESIGN: It's a durable, clear, hard acrylic dome 12.99" in outer diameter, with a black trim-ring and all necessary hardware for easy DIY installation into your wooden or fence. EASY TO INSTALL: Come with bolts, nuts for fixing. It is easy to install in wood panel fencing, fencing, wood and dry wall. Cleaning is also very easy. REDUCED BARKING: Through the window, your pet can see a full view of the other side. It can help stop excessive barking since the dog will be able to see what they smell or hear just outside the fence. SATISFY CURIOSITY: It's designed in hopes it will help satisfy their curiosity while alleviating any desires to claw under the fence to get to the other side. The window makes it possible for them to have a peek. WIDE APPLICABILITY: The window is a dome shaped to fit any dog muzzle nicely and perfect for backyard fence. It also has other ideas for usage include dog kennels, henhouse and even playhouses for children. Specification: Material: Acrylic Size: outer diameter-33cm or 12.99inch Package Includes: 1 Piece Dog Fence Window 1 Set Accessories Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.