Which of the following items are used for heavy rigging?

The use of slings, shackles, and a spreader beam is essential in heavy rigging due to their specific capabilities and design to handle significant loads safely and effectively.

Slings come in various materials, such as wire rope, chain, or synthetic fibers, and are specifically chosen based on their strength and flexibility to distribute weight evenly while securing loads for lifting. Shackles are vital connectors that ensure secure attachment points in the rigging system, allowing for strong and reliable connections without compromising safety. The spreader beam plays a critical role in load distribution; it prevents loads from tipping or swaying by providing a wider connection between lifting points, thus enhancing stability during the lifting process.

These components are specifically designed and rated for heavy-duty applications, making them indispensable for safely rigging and lifting large objects in industrial settings. Other items mentioned in the other options may have appropriate uses in various rigging situations but do not match the heavy-duty requirements as effectively as slings, shackles, and spreader beams do.