How can the dimensions of a hole be indicated most conveniently on a drawing of the part?

The option that states using a brief note connected by a leader to the hole is often the most convenient way to indicate the dimensions of a hole on a drawing. This method allows for clarity and reduces clutter on the drawing. By connecting a leader line from the note directly to the hole, it clearly associates the dimensions with the specific location of the hole, allowing anyone reading the drawing to easily identify what is being referenced.

This approach is particularly effective in detailed drawings where multiple dimensions exist in close proximity. It helps maintain the readability of the drawing, ensuring that details are presented clearly without overwhelming the viewer with too much information crowded around the hole itself.

In contrast, placing a box around the hole might create ambiguity if multiple dimensions or annotations are present nearby. Writing dimensions directly inside the hole can clutter the drawing and may be difficult to read, especially in small holes. Drawing a detailed view could provide precise dimensions but may be an unnecessary complication if a simple note is sufficient for the information needed.