HIGH PRECISION: There is an angle line hole inside to draw the line directly, which is more accurate. Entitled with practical adoptability, the ruler's high quality can keep its high performance for a long time. PROTRACTOR: Protractor supports marking dial with clear handwriting, easy to use in the practical life. WIDELY USED: Protractor is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement, ideal students, craftsmen, and designers. HIGH QUALITY: Made of stainless steel material, angle measuring tool is wear-resistant, not easy to . quality, , can be used for a long time, not easy to damage, very practical. FUNCTION: When it comes to the scope of application, this protractor can be used for drawing circles, measuring angles and marking.