The claw type topping machine is used for the load to be lower from the ground and the general jack cannot work, so the claw type is used to support the load. 
The claw jack is a light lifting device that uses a rigid lifting member as a working device to lift a heavy object in a small stroke by a top bracket or a bottom bracket. This jack is used when the general jack cannot match the height of the top weight. The rocker can rotate 270 and will automatically return to the oil when it reaches the height limit.