Final answer:
Slings, chains, grabs, shackles, and ropes are considered part of the rigging system when transporting or lifting materials with a crane.
Step-by-step explanation:
The slings, chains, grabs, shackles, and ropes that are used to transport or lift materials with a crane are considered part of the rigging system.
Rigging refers to the arrangement of these tools and equipment to safely handle and support the load being lifted. It includes the selection, inspection, and proper use of these components to ensure the safe and efficient operation of the crane.