At the 10 mark of a lead line, what feature is present?

At the 10 mark of a lead line, there is a strip of leather with a hole. This detail is significant for mariners as it serves a specific purpose. The leather strip at this mark assists in measuring depth when using a lead line. The hole allows a line or additional marking to be attached, making it easier to identify and reference this specific depth more easily while at sea or during navigational maneuvers. It helps in standardizing the depth measurement process, ensuring that sailors can communicate effectively about water depths they encounter.

The other options do not reflect the standard practices associated with lead lines. For instance, a white rag is typically found at the 0 mark of a lead line to provide a clear visual mark for shallow depths. The presence of multiple strips of leather is not standard for the 10 mark; rather, only one is utilized for clarity and simplicity in depth assessment.