Multifunctional Folding Triangle Ruler: Joiner's Square Folding speed square, 6 inch folding extension arm can meet 6 inch or 12 inch layout needs when opened, the measuring distance will increase. When folded, the storage space will be reduced, making it easy to carry. It has 2 measurement units, metric and imperial, which is more convenient for your measurement habits. Adjustable Carpenter's Square Tools: The triangular ruler can be bent and the angle can be adjusted use the carpenter squares adjustable positioning tool to freely choose the angle, after adjusting to the desired angle, tighten the positioning nut and press the center pull rod to achieve precise positioning a variety of measurement functions, suitable for different scenarios. High Quality MaterialCarpenter's Square: The carpenter's squares are made of high quality aluminum alloy, with matte black finish to prevent glare, corrosion resistance and good oxidation resistance, not easy to break. Stainless Steel Needle Square Joiner Carpenter : The inner magnetic ruler can be kept intact, not easy to fall off, and has a long service life. Stainless steel scriber concealed with line at the end, screwed and fixed on the ruler body, not easy to fall off and easy to carry. Speed Square widely Used : Multi-functional folding triangular ruler for woodworking, can draw 45-90 angle, balance line, vertical line, and draw equidistant center point and adjustable positioning knob corresponding to all points of intersection of the drawn line and the edge are equidistant. To draw slopes, chamfer the ends of the roof rafters and open the beaks.