Metric Triangle Ruler: Includes 1 piece of 17cm metric triangle ruler with matte black finish to prevent glare, corrosion resistant, durable and unbreakable. Completely free of sharp edges, it will not hurt your hands. Premium Quality: Metric Rafters, the rafters are made of high quality aluminum alloy, which is hard, strong and rust resistant. GENERAL USE: This woodworking square can be used as a protractor, miter connector, wire saw guide, framing square and ruler, perfect for all construction and renovation projects. EASY TO MARK YOUR CUT LINE: Designed with a thicker edge, this triangle ruler can be used directly with a saw to make crosscuts or miter cuts using the etched protractor scale, allowing you to quickly and accurately mark the cut line of your longitudinal beams. Satisfaction: High quality products and customer service for all customers.