Classroom Set of 30 Student Protractors w/2 Pencil Holes, 180 Degree 6 Inch Ruler Clear Plastic School Math by OnlineScienceMall at On Becoming a Writer. MPN: 60132. Hurry! Limited time offer. Offer valid only while supplies last. 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.Pack of 30. Clear plastic. 2 Pivot Points: Pencil holes are located at the 90 degree mark and 3 inch
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