High Quality Material: Made of high quality anodized aluminum, corrosion resistant, durable and lightweight, not easily deformed. The edges are chamfered, no accidental cuts. High Visibility: Clear graduations and precise markings work well on any plane or surface; 3-sided metric scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:150. Laser Engraved: The markings on the ruler are laser engraved for perfect definition. Very fast and easy reading without error. These permanent markings and grooves will not fade or stain. With Protective Case: The triangle ruler comes with a reusable and unbreakable protective case, allowing you to take your ruler anywhere without damaging it. Wide Application: The multifunctional metal scale ruler can be used for cutting, measuring, professional drawing, decoration design. The perfect measuring tools for architects, draftsmen, engineers, teachers and students.