Ideal Drafting Tool:It is convenient to be used as a professional tool for school learning, also great maths tools for office school supplies, also fit for classroom, office, home, engineering, etc. Durable Plastic Protractor ：Crafted from plastic, this 360 protractor is built to last, offering high toughness and fine workmanship for precise measurements every time. Easy To Draw And Adjust:Small size, lightweight, easy to store. Clear color makes you measure easier, and you can see the numbers and letters on-page through the protractor. Features Good design:Unique rotating device and transparent design. The swingarm provides a straight-edge guide for drawing angles. Beautiful and simple. Product Specification:Material: Plastic, Diameter Size Optional: 20cm . Packing List: 1 x 360 Degree Protractor Ruler.