The Dreambaby Cosmopolitan 9 cm Gate Extension works with the Dreambaby Cosmopolitan Easy-Close Security Gates to extend the width of the gate. Extensions add versatility and many extra uses to safety gates. Extensions allow you to use gates all around the home, including in areas with wider openings. This adds extra safety for your young ones. Of course, not all hallways or stairways fit gate measurements - using an extension means that this does not jeopardize the security of your child, even in rooms which require a much longer partition. Safety gates are a very important part of at-home safety. They provide safer boundaries for your child, preventing them from entering potentially dangerous or unsupervised areas of the home. The Dreambaby Cosmopolitan Gate with optional extensions is expandable to 138 cm. Extensions are available in 9, 18 and 27 cm options. Measure the opening before deciding on your Dreambaby safety gate. Simply attach the extension to your gate before installing.