The safety compass and swing arm protractor is perfect for drawing circle and learning about angles. Works great as a learning tool for students and useful for home and office use.Details:Includes assorted colors12 safety compass and swing arm protractorSafety compass creates circles up to 12" diameter, features positive pencil lockComplete with pencil, inch and centimeter guide6" swing arm plastic protractor, which features an open center, sharply defined graduations and is complete with 6" rulerFor ages 8+