Alumicolor tempered aluminum drafting triangles are lightweight and durable, featuring a matte-satin finish that resists stains and tarnishing. Photo-anodized calibrations resist cleaning or rubbing off. Ultra smooth finish won't mark your work surface. Features both customary and metric graduations. May also be used as a template for drawing small circles. Available in 30-60-90 and 45/90 in several popular sizes. Perfect triangles for your home, office, studio, or shop.