1/2 Ton Cap., Spanco, Aluminum Gantry Crane, Height Extension KitOrder a 2' extension kit to increase gantry crane height (for 8', 9' and 10' models only). Only one extension kit can be used per crane - additional extension kits cannot be used with cranes originally supplied with an extension kit. *Spanco Gantry Crane model number and serial number must be provided to process an order for this item. Product Specifications ASSEMBLYAssembled BRANDSpanco CONSTRUCTIONAluminum MANUFACTURERS PART NUMBER5-1380 TYPEAccessory WEIGHT LBS15