Perfect for students and professionals alike, this geometry set contains a 180° protractor, 45° and 60° triangles and a 8" ruler. The rulers and triangles all have inch and centimeter calibrations for all your measuring needs, and have a clear construction that allows you to see the material you are working with. Details:Clear4 piecesInch and centimeter calibrationsAcrylicContents:180° protractor45° triangles60° triangles8" (20 cm) ruler