Which of the following is a common tool used in rigging?

The hydraulic jack is commonly used in rigging because it provides the necessary lifting power to move heavy loads. This tool operates on the principle of hydraulic force, allowing the user to lift substantial weight with relatively little effort. In rigging applications, hydraulic jacks are essential for adjusting the height of loads or for lifting them to negotiate obstacles. Their ability to control heavy items safely and efficiently makes them indispensable in various rigging scenarios, including construction and heavy machinery setups.

While leveling instruments are important for ensuring that items are aligned correctly, and friction tape can be useful for insulating or bundling, these tools are not specifically designed for the lifting and moving tasks that a hydraulic jack performs. A chainsaw, on the other hand, is primarily for cutting wood or similar materials and does not fit into the rigging category. Hence, the hydraulic jack stands out as the most relevant and widely utilized tool amongst the choices provided for rigging operations.