MHH gantry crane with electric hoist of CD or MD type, is a small rail crane. The lifting capacity is 3-16 tons, while span of 12 to 30 meters shall apply, with work temperature of - c - 20 + 40 c. This kind of product is a regular crane, http://www.clxzkj.com/ and widely used at open ground and warehouses to load and unload. This product is controlled by the ground and indoor manipulation for user to choose.