【Multifunctional Folding Triangle Ruler】: This carpenter's square features a folding speed square and a 6-inch folding extension arm that can accommodate 6-inch or 12-inch layouts. When open, the measuring distance increases. When folded, it reduces storage space, making it easy to carry. It has two units of measurement, metric and imperial, which is more convenient for your measuring habits. 【Adjustable Carpenter's Square Tools】: The triangular ruler can be folded, and the angle can be adjusted. Use the adjustable carpenter's square positioning tool to freely choose the angle. After adjusting to the desired angle, tighten the positioning nut and press the center pull rod for precise positioning. A variety of measuring functions, suitable for different scenarios. 【High-Quality Material Carpenter's Square】: The carpenter's squares are made of high-quality aluminum alloy, with a matte black finish to prevent reflections, corrosion resistance, and good oxidation resistance; not easy to