No assembly required. Made from steel. 5 in. W x 1 in. D x 40 in. H (2 lbs.). The Bindaboo Gate Extension works with the Bindaboo Security or Hallway Gate to extend the width of the gate. Add an extension to your extra tall Bindaboo security gate with this durable steel unit, a great way to get the extra width you need so pets and active toddlers remain safe and secure. Finished in white, the gate extension is available separately in other color options.