Westcott Protractor Angle Measuring Tool with sturdy quality and convenient design gives you the best using experience. This measuring tool is 7 Inch goniometer quick angle protractor with legs that rotate around protractor scale to read angles. Translucent ruler made of clear plastic allows you to see through the page while working on a project with 7 Inch arms that opens up to 12 Inches. Westcott focuses on creating innovative designs that provide style and quality to an assortment of school, craft, and office products which are perfect for your drafting and drawing needs.