[PREMIUM QUALITY] The architect imperial scale and engineer scale set and straight ruler is made of anodized aluminum alloy, very solid and sturdy. Designed for maximum durability, the 3 sided drafting ruler is perfect for lasting use

[PRECISE IMPERIAL SCALE] The architectural scale ruler, engineering scale ruler and standard metal ruler are professional grade with supreme accuracy. With reliable construction and accurate performance, the black architect ruler triangular, engineer ruler triangular and straight edge ruler are ideal for architects, engineers, draftsmen and students

[TRIPLE SIDED DESIGN] The classic architectural ruler's triple-sided scale included: 1-1/2", 1, 3/4", 3/8", 3/16", 3/32", 1/2", 1/4", 1/8", 3, 16; the classic engineering ruler's triple-sided scale included: 1:10, 1:20, 1:30, 1:40, 1:50, 1:60; the 12 inches straight edge ruler with millimeters, centimeters and inches, the back of this straight ruler has a conversion table for millimeters and inches.

[LASER ETCHED TECHNOLOGY] All numbers and measurement markings on drawing ruler are laser etched for maximum clarity and readability. Laser etched technology effectively prevents architects scale numbers and markings from wearing off or fading away

[GREAT GIFT FOR ENGINEERS] If you are satisfied with the architecture ruler metal and engineering triangular scale, you can give this ruler set as a gift to engineers that will help them a lot