What is the width of a extension line?

The width of an extension line in technical drawings is typically set to 0.5 mm or 0.35 mm, depending on the drafting standards being followed, such as ISO or ANSI. Extension lines are used to indicate the starting and ending points of dimension lines, and their width is designed to be clear and easily distinguishable without overpowering the drawing. Always refer to the specific standards applicable to your project for precise dimensions.