Alvin plastic triangular mini engineering scale. High-quality 6" engineers scale is made from high-impact plastic with white, non-reflecting dull-matte faces and tapered edges. Printed graduations and color-coded furrows. Graduated in 10, 20, 30, 40, 50, and 60 parts to an inch, fully divided. Alvin 610E plastic engineering scale includes plastic storage sleeve. Great pocket ruler for job sites and on-the-go engineers, drafters, construction professionals.