... more safe. 2) 300Ton Hydraulic Grab Hoist Winch for a Dredger Specifications300Ton Hydraulic Grab Hoist Winch for a DredgerStructureIt consists of hydraulic ... brake, manual operation valve, etc. One drum for lifting purpose, another drum for OPEN/CLOSE of the Grab. ... (2nd layer, static)Disk Brake holding load100Ton for lifting drum (2nd layer, static) 300Ton Hydraulic Grab Hoist Winch for a Dredger