What should be used to connect a hook to an eye for secure lifting?

Using a shackle to connect a hook to an eye for secure lifting is the best choice because shackles are specifically designed for heavy lifting and load management. They provide a strong and reliable connection point that can handle the forces exerted during lifting operations.

Shackles come in various types, such as round and screw pin, making them versatile for different applications and load requirements. They are also designed to distribute the load evenly and contain safety features to prevent accidental disengagement. This reliability is crucial in rigging operations where safety and stability are paramount.

Other options may not provide the same level of security or are not designed specifically for this purpose. Clips can slip under certain conditions, bolts may require additional assembly, and chains, while useful for certain applications, do not create a solid connection like a shackle does. Thus, a shackle ensures the safest and most effective connection for lifting operations.