Westcott Metric Protractor Transparent Ruler with sturdy quality and convenient design gives you the best using experience. This protractor ruler has 180 Degree protractor and 4 Inch scale. Clear ruler made of transparent plastic allows you to see through the page while working on a project. 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.