What is the primary function of a Snubbing knot?

The primary function of a snubbing knot is to control tension when untying, which makes it a valuable tool in lifting and rigging applications. This knot is generally used to secure a rope in such a way that it can be easily released or loosened without excessive tension making it difficult to untie. This property is especially important in situations where the knot may be subjected to a heavy load.

When using a snubbing knot, the design allows for quick adjustments to the tension without completely releasing the knot. This characteristic is particularly useful for operators who need to regularly secure and release their equipment without the complications or hazards that can arise from other types of knots that may jam or become tightly bound under load.

In contrast, the other functions represented by the other options do not align with the specific characteristics of a snubbing knot; it is not primarily intended for hoisting materials, joining two ropes, or securing knots in a manner that locks them in place under pressure. Thus, the functionality of the snubbing knot in controlling tension when untying is essential for efficient and safe rigging practices.