McMaster 1216T6 Drafting Ruler, Inch, Triangle, Engineers' Scale

Sketch buildings, roads, and other life-size objects to scale. These rulers feature the standard scales used by architects or engineers. All have beveled edges, so you can be confident your lines will be accurate and consistent no matter what angle you view the ruler from.

Triangle — To quickly identify the scale you need, these rulers have a different-colored groove on each of their three sides.