What is the main purpose of leader lines in technical drawings?

The main purpose of leader lines in technical drawings is to indicate the measurements of features. Leader lines are used to direct attention to specific notes, dimensions, or details on a drawing, ensuring clear communication of critical information about the elements depicted. They typically point from a measurement to the feature being referenced, helping readers of the drawing easily understand what dimension or annotation relates to which part of the design.

By fulfilling this role, leader lines enhance the clarity and functionality of the technical drawings, crucial for effective design and manufacturing processes. This makes it easier for engineers, designers, and fabricators to interpret and implement the plans accurately. The other options do not align with the primary purpose of leader lines; while they may involve various aspects of technical drawings, they do not emphasize direct measurement indication, which is central to the use of leader lines in engineering documentation.