360 circle measuring tool. Transparent plastic for precision. Swing arm provides straight-edge guide for drawing angles. Suitable for school learning, also a great maths tools for office and school spplies. for architects builders, electrician, interior designers, engineers, students etc. Features - Color: Sky blue. - Material: Plastic. - Size: 10.00 x 10.00 x 1.00cm/ 3.93 x 3.93 x 0.39 inch. - can easily adjust the ruler to the proper position to determine the needed angle, which is humanized and considerate. - Our round head protractor is suitable for drawing, architectural design, woodworking, angle and length measurement and more. - You will receive 5 pieces angle measure tools, enough quantity for daily measure use and replacement, also you can share them with friends or family. - On the back there is a slight , so that the scale never the paper, increasing its durability. - Great for use in schools, offices, for technical drawing or even in your home. Package list: 5 x protractors