The 6"Architectural Engineering Aluminum Triangle Scale Rule is, rustproof, perfectly balanced, and it has laser-etched markings with a sleek black . It has 3 concave sides with 6 different scales, laser etched markings and can be marked with precision. It can make your and drafts more accurate. In addition, it is easy to read measurements and easy to carry. Suitable for architects, engineers, draftsmen, builders, roofers, teachers and students, etc. Also for cutting, measuring, professional drawing, decoration design, classroom and office use.
