1【Standard Imperial Size】12-inch imperial architectural scale ruler includes: 1-1/2, 1, 3/4, 3/8, 3/16, 3/32, 1/2, 1/4, 1/8, 3, 16. | 2【Aluminum Architect Scale Ruler】Engineer scale ruler is made of solid aluminum, durable and corrosion resistant, will not rust. The engraved white markings mark the precise and clear numerical scale. The drafting ruler is perfect for office drafting work or school classroom study. | 3【Accuracy and Precision】Architectural scale come with durable laser-cut imperial prints to ensure accuracy. The engraving technology effectively prevents scale numbers and markings from wearing or fading, and the markings are clear and easy to read. | 4【Classic Trigonal Design】Triangle ruler has 3 sides and 6 different proportions, all calibrated before leaving the factory, high precision, stable performance of the engineering scale ruler, pressure and wear resistance, no deformation. | 5【Wide Practicality】Sided architectural ruler is perfect for architects, engineers, blueprinters, interior designers, modelers, draftsmen, graphic designers, technicians, artists, teachers and students. | 6【Professional Rulers for Drawing】Scale ruler for blueprints is designed for drawing and measuring architectural drawings, such as floor plans and blueprints. Aluminum architect triangular ruler are used as blueprint rulers, contractors or construction rulers. With its professionalism, accuracy and practicality, it is deeply favored by the market.