Collapsible ruler bar: 6-inch fold-out extension arm for 6inch or 12inch layout needs, increase measuring distance after opening, reduce storage space after folding.convenient to carry. Embedded powerful magnet: easy to open, no folding,no shaking off, durable. Stainless steel needle drawing tool: the tail is screwed and fixed on the ruler body easy to carry. Adjustable positioning tool: when in use, it can adjust to the required angel, tighten the nut positioning, press the middle adjustable lever to achieve precise positioning. Material: solid aluminum alloy construction for durability. Portable: lightweight and easy to store in your work pouch or pocket. Specification: Material: aluminum alloy Color: black+red Triangle ruler part size(approx): 184mm*251mm*25mm/7.24*9.88*0.98inch (length*longest side length*height) Extension arm size(approx): 158*27mm/6.22*1.06inch (length * height) The total length of the longest side(approx): 317mm/12.48inch Package Included: 1 X Triangle Square Ruler