Hubbell Heavy Duty Overhead Tool Crane Kit 12ft., 250 Lb. CapacityRugged bridge crane design allows for overhead tool handling. Heavy Duty Rolling Rail mounts in two parallel rails, which must be supported every 6' (1.8m) to maintain rated capacity. Recommended distance between support rails is length of tool rail less 12 (305mm). Maximum rated capacity of rolling rail includes tool, balancer, and attachments.250 lb. Capacity Rolling Tool Rail includes (4) WS60-FT trolleys, (2) 2 x 4 steel tool track bridges, (2) WS60-HG hanger brackets, (1) WS60-BT tool trolley, (2) WS60-ES end stops, (1) WS60 tool rail (length per model), (1) WS60 reinforcing rail (144 unit only), (2) safety chains, assembly brackets and hardware.One Year Limited Warranty. Product Specifications CAPACITY LBS250 COLOR FINISHBlack/Galvanized ASSEMBLYUnassembled BRANDHubbell Workplace Solutions CONSTRUCTIONSteel DESCRIPTIONTool Crane Kit MANUFACTURERS PART NUMBERWS60-ET12 WEIGHT LBS120 WIDTH FEET12