Double-girder grab, bucket, grab hook and magnet, magnetic/electromagnetic dual-purpose bridge crane, widely used for bulk cargo transportation, assembly, loading and unloading in mines, ports, factories, workshops, warehouses, freight yards and other places. The opening direction of the grab is divided into two types: parallel to the main girder and vertical. The winch trolley is equipped with magnets, magnetic or electromagnetic chucks. The grab can adopt double-rope or four-rope wire rope, mechanical or electro-hydraulic drive according to different work tasks and material types.