What is a "spreader bar" used for in rigging?

A spreader bar is specifically utilized in rigging to distribute the load evenly across multiple slings, which helps to balance the weight and reduce the risk of slippage or overload on any single sling. By maintaining an even load distribution, the spreader bar ensures the safety and stability of the lifted object, allowing for a safer and more efficient lift. This design minimizes potential points of stress and increases the overall effectiveness of the rigging setup.

Other options do not correctly describe the primary function of a spreader bar. While lifting loads vertically without additional support pertains to general lifting practices, the main advantage of a spreader bar is in its load distribution capabilities. The idea of reducing total weight being lifted is misleading, as a spreader bar does not alter the weight of the load but rather how it is supported. Lastly, while communication among rigging teams is vital, a spreader bar itself does not serve to simplify communication; its purpose is mechanically focused on load handling.