: Architectural ruler is durable, and solid high quality aluminum can reduce bending and warping. Multipurpose: Suitable for architects, engineers, draftsmen, builders, roofers, teachers and students, etc. Also for cutting, measuring, professional drawing, decoration design, classroom and office use. -friendly: 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. Again, these markings 't fade or smear, so you'll always see each step clearly. Attractive: The scale ruler is lightweight, rustproof, perfectly balanced, durable, and it has laser-etched markings with a sleek black finish. In addition, it is easy to read measurements and easy to carry. Material:aluminum colour:Black Package Contents: 1 x ruler Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.