Single rope Radio Remote Control Clamshell Grab bucket hydraulic grapple This novel bulk grab can automatically close on the material pile and open in the air without any additional energy. It has both the advThis novel bulk grab can automatically close on the material pile and open in the air without any additional energy. It has both the advantages of simple structure and reliable operation of the rope type grab and high productivity of the powered grab. As a result of the combination of mechanical structure and electronic device, this new invention enjoys high reputation from our customers. Its birth terminates the low efficiency of single rope grab in hoisting.antages of simple structure and reliable operation of the rope type grab and high productivity of the powered grab. As a result of the combination of mechanical structure and electronic device, this new invention enjoys high reputation from our customers. Its birth terminates the low efficiency of single rope grab in hoisting.