- Very clear scale number, ensure the accuracy, excellent and useful drawing tool set for you. - Professional grade for super accuracy protractor scale for easy and quick selection of the desired scale. - Convenient to measuring, portable to use, and sturdy for student, teacher and painter. - All measurement tools are constructed with plastic, high-visibility, smooth polishing, reliable and useful. - Compact size and light weight, portable for students to carry it for school use., Manufacturer: ZKLGS