[PREMIUM QUALITY] The architect imperial scale and engineer scale set 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 and engineering scale ruler are professional grade with supreme accuracy. With reliable construction and accurate performance, the black architect ruler triangular and engineer ruler triangular 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, very convenient and useful for professional use and drafting rulers for drawing can meet your needs

[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