Technical characteristics:The limiting size is the lowest between he top of crab and the track of trolley,that is to say,it reduces 20%-30%compared with traditional products.which can reduce the capital of workshop 20%efficiently.It has hard-tooth reducer,imported wire-rope,and trinity drive.It is equipped with such protecting devices as alarm device to overloading,obliquely hanging,second protecting equipment preventing hook clashing the top,protecting the current lacking of any phrase etc.