The Renewed Bamboo IGT Sliding Extension is made of sturdy laminated bamboo in an updated finish. Use it to easily add extra work space to your Iron Grill Table system. The Renewed Bamboo IGT Sliding Extension does not require a hook. but slips into the ridges along the outside of the frame. Pair the Renewed Bamboo IGT Sliding Extension with the IGT Four Unit Frame and the Renewed Bamboo IGT Table Long.