Product Description: Quantity: one piece Weight: 350g 6" Foldable Triangular Ruler The retractable square ruler can increase the measuring distance when opened, save storage space and easy to carry when folded. 6" folding extension arms eliminate the need for 7" and 12" squares. Great gift for professionals and DIY dads (including pen)! Adjustable Positioning ToolThe angle can be freely selected. After setting the desired angle, tighten the positioning nut and press the center pull rod for precise positioning; a variety of measuring functions are suitable for different scenarios. NEW 4 IN 1 TOOLSThis new aluminum carpenter's square includes 5 tools: ruler, square, carpenter's gauge, angle measure. Can be used as a protractor, line plotter, saw guide and square. Moreover, the stainless steel needle drawing tool is fixed on the ruler with screws at the tail, which is convenient to carry. It is the most versatile and practical wood scribing tool! High Quality Carpenter's Square RulerThe folding square ruler is made of high quality aluminum alloy, with a matte black finish to prevent glare, corrosion resistant and durable, and not easy to break. No sharp edges to hurt your hands. Built-in Strong MagnetBuilt-in strong magnets keep the arm retractable, easy to open and fold, no wobble, durable and perfect tool for carpentry projects, roofing, construction and renovation.