Made of 5mm aluminum alloy with durable metal knobs and bolts, this universal angle ruler is more durable and sturdy than the plastic one. Coated with black oxidation, the angle measurement ruler is rust-proof and won’t scratch working surfaces. With high visibility and accurate laser etched graduations ruler measurement markings, the multi-angle ruler is wearproof and durable. The marking template tool is handy for creating bull eyes, arches, plumb cuts, and any projects that you can think of, works great on carpentry, brick, tile, wood, glass, stone, laminate, construction & engineering projects, and much more! It's a perfect angle ruler alloy for Carpentry, Bricklayer, Craftsmen, Handymen, DIY-ers Our aluminum alloy tile ruler is newly upgraded and feature-rich. It is an angle measuring tool and tile positioning hole opener. Other common measuring scales consist of only a four-piece ruler. Our newly upgraded adjustable angle ruler has a six-piece ruler and six metal knobs that fold freely. Simply adjust the six metal knobs to precisely create the shape you want. Measuring objects of different shapes is quick and easy. *Inches and centimeters are not printed on the scale as shown in the picture