Features. Multi function. Designed to fix on the wooden board tube or three-dimensional objects for measuring and cutting work. High performance. Equipped with clear scale of high-precision measurement able to draw 45 degrees and 90 degrees angles. Exquisite workmanship. The ruler surface has anodized oxidation process rustproof and anti-corrosion with reliable use and stable performance. Superior material. Made of high-quality aluminum alloy material wear-resistant and durable with long service life. Wide application. Widely suitable for automotive woodworking construction drilling machinery and other industries. Specifications. Material: aluminum alloy. Item Color: red/blue. Angle Error: