Which of the following is NOT a part of securing metal coils?

In the context of securing metal coils during transportation, pallets serve primarily as a base for storing or transporting items rather than a method of securing them. Straps, chains, and tarps are all directly involved in securing metal coils.

Straps and chains are specifically designed to hold the coils tightly and prevent them from shifting or rolling during transit, reducing the risk of damage or accidents. Tarps can be used to provide additional protection against environmental factors and help contain any loose items.

Pallets, while they can be used as part of the overall system for transporting metal coils, do not actively secure the coils themselves; rather, they provide a stable foundation. Thus, the option related to pallets is not a part of the direct securing process.