Standard classification group: A3~A5, work-ing circumstance:-20~40℃,normally used with electrical hoist by ground for loading and transit-ing in common plants and warehouses. These series of cranes are neither suitable for medium where there are fire and volatile danger, humidity exceeding 85%, exists highly corrosive chemical gases, nor lifting or carrying molten metal,poisonous, combustible,explosive goods. Frequency converter and remote control can be setted on cranes according to user requirement.