Carpenter Square, Adjustable Square Folding Square Ruler, Extendable Layout Tool Folding Square Rule Extendable layout tool is multifunctional folding square ruler for woodworking, which can draw 90 angle, balance line, vertical line and equidistant center point and the adjustable positioning knob corresponding to the drawn line and the edge of all intersection points are equal. Features Extendable layout tool -Color: As shown. -Material: Aluminum alloy. -Size: Folded: 16.5x18.3cm/6.50x7.20inch; expanded: 31x18.3cm/12.20x7.20inch. Ruler base thickness: 25mm; Ruler thickness: 8mm. When in use, it can adjust to the required angel, tighten the nut positioning, press the middle adjustable lever to achieve precise positioning. Package Including 1 * extendable layout tool