Features: Foldable design - the ruler has a 6-inch extension arm for longer distance measurement, which can fold up to compact size, making it easy to store and carry. Quality material - made of aluminum alloy, wear-resistant for long time use, with clear laser-engraving scale, easy to read. Multifunctional - integrated design, can be used as a circumference ruler and protractor, great tool for woodworking. Embedded scriber - comes with a scriber which is screwed and fixed on the ruler body for easy carry, easy to take out and use when needed. Adjustable positioning tool - it helps to fix the position of the ruler when measuring the angle, making the measurement more precise.