... .ISO certificate 5ton Truss Type electric hoist cantilever gantry craneTechnical featurers:1) Trussed type,welding by machine hand. ... Weight overload protection device, top quality polyurethane buffer, crane travelling limit switch,low voltage protection function, emergency ... duty crane,it is widely used in plants,warehouses,materials stocks to lift goods or materials. truss-type crane/ gantry crane