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These 180 degree clear plastic protractors have both a 6 inch ruler edge and a 10 cm ruler on the open center. Pencil holes are located at the 90 degree mark and 3 inch ruler mark. The black markings clearly define the 1 degree increments making it easy to read. Plotting 0 to 180 degrees can be done left to right and right to left. Great for art or geometry class and home crafts. Pack of 30.
Classroom Set of 30 Student Protractor 180 Degree 6 Inch Ruler Clear Plastic School Math - B01L9WMLUO