Which of the following is a common type of rigging hardware?

The correct answer identifies shackles, turnbuckles, and slings as common types of rigging hardware. These components are essential in the rigging process, as they are specifically designed to connect, adjust, and support loads during lifting operations.

Shackles are used to connect various rigging elements, such as slings and hooks, and are known for their strength and durability. Turnbuckles allow for the tensioning and adjustment of rigging systems, making them crucial for maintaining the proper load distribution and stability during a lift. Slings serve as the primary means of attaching the load to the lifting device, and they come in various materials and configurations to accommodate different types of loads and conditions.

In contrast, while gears and pulleys play significant roles in mechanical systems, they are not classified as rigging hardware in the same context. Hooks and pulleys can also be found in lifting operations, but the combination listed in the selected answer provides a more comprehensive foundation for various rigging tasks. Lastly, nuts and bolts pertain more to fastening and structural applications rather than to the specific functions of lifting and handling loads in rigging operations.