steerable machine skate means three points roller skate

roller skids crawler type means go straight roller skateShan Dong Finer Lifting Tools co.,LTDproduce all kinds of cargo trolleys professionally for more than 20 years.we can produce followcargo trolleys: go straight cargo trolley, turntableroller skids, crawler type roller skate,steerable machine skate, veeredmoving roller skids, geared roller skids, and so on. According to the wheels materials of the cargo trolley, it have follow kinds: PU wheels cargo trolley, nylon wheels