Exactly depends on available crane on side;
For ship cranes, both manual and electro-hydraulic versions are available. The electro-hydraulic version requires a cable drum system or manual cable control by an operator.
For material handler or excavator cranes, hydraulic versions are suitable. These can be powered by the crane’s hydraulic system and feature a 360-degrees rotating function. Big bags can be connected by an operator and discharged automatically.
For mobile harbour cranes, the electro-hydraulic version can be selected and activated from the crane’s operator cabin, provided the crane is equipped with a spreader mode. Big bags can be connected by an operator and discharged automatically.