Which information is essential for identifying the capacity of a sling?

The essential information for identifying the capacity of a sling is the Working Load Limit (WLL). The WLL indicates the maximum weight that a sling can safely support when lifting. It is a critical factor for ensuring safety and preventing accidents during lifting operations, as using a sling beyond its WLL can lead to failure, which poses serious risks to both personnel and equipment.

The other options provide information that may be useful in specific contexts but do not directly inform about the sling's capacity. For example, the manufacturer's address is relevant for warranty claims or quality assurance but does not contribute to understanding how much weight the sling can handle. Similarly, the color of the sling may indicate certain safety features or classifications but is not a direct measure of its capacity. The length of the sling may affect how it is used in certain applications but does not determine its lifting capability. Thus, understanding and adhering to the WLL is paramount in ensuring safe lifting practices.