About the Windsor Arch Gate Extension: Our pet gate extension helps cover wider openings by adding an additional 13.5 inches to the width of your MYPET safety gate. This extension is 28.5 inches tall. This safety gate extension only works with the MYPET Windsor Arch Gate (ASIN B00N77B9SK). Gates sold separately. This pet gate extension panel is easy to install. Just insert the extension ends into the gate (guide pins included) and pressure mount as directed. Our extension will not work with any other gates. A maximum of 3 extensions can be used for a gate to fit spaces 28.25 inches up to 71.25 inches. Our safety gate extensions allow you customize your gate to fit large spaces