A drafting pencil, also known as a mechanical pencil, is a writing instrument that uses replaceable leads and a mechanism to advance the lead so that it can be used to write or draw. It typically has a thin and precise lead and is used for technical drawing, drafting, and other precision work. It is preferred by many architects, engineers, and artists for its accuracy and consistency in line width. Drafting pencils are typically made of plastic, metal, or a combination of both and come in different sizes, shapes, and lead hardness.
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