- This woodworking ruler is made of stainless steel, which is very rust-proof, durable and not easy to break. With the precision digital scale, users can easily read and use the numbers on the ruler. Adjustable Nut - The nut allows you to adjust the nut to loosen or tighten the protractor to achieve your desired angle. Can be used to set up chamfers, measure, draw radial lines, and more. Dual Arm - This ruler has two functions: a fixed ruler for measuring length (10 inches or 250 mm), and a moving ruler for measuring length from 0 to 30 cm. A sturdy ruler with a protractor can measure from 0 to 180 degrees. WIDE USE - This protractor is suitable for student drawing, mechanics, carpenters and carpenters, vehicle maintenance, repair, construction, construction, and more. Satisfied Service - Enjoy our Satisfaction within a month Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.