With over 54 years of experience Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Together with this core group of products we continue to meet the needs our customers with our expanding range of fine art hobby and craft supplies our large selection of drawing room furniture and our wide assortment of exclusively-designed products. Define measure make lock and transfer any angle in seconds. Just rotate the blades and read the dial. This precision tool features a tolerance of 5/1000ths of an inch and a patented 360 fully adjustable protractor/bevel square. Quint Graphics True Angle. Maker of 23