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 yourIron Grill Tablesystem. 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 theIGT Four Unit Frameand theRenewed Bamboo IGT Table Long.