1、Made of aluminum alloy, wear-resistant for long time use, with clear laser-engraving scale, easy to read. 2、Integrated design, can be used as a straight ruler and a protractor, great tool for woodworking. 3、With adjustable angle, you can scribe lines at different angles, and fix the position of the ruler when measuring the angle, making the measurement more precise. 4、A handy tool for constructors, designers, carpenters,etc. Features: Made of aluminum alloy, wear-resistant for long time use, with clear laser-engraving scale, easy to read. Integrated design, can be used as a straight ruler and a protractor, great tool for woodworking. With adjustable angle, you can scribe lines at different angles, and fix the position of the ruler when measuring the angle, making the measurement more precise. A handy tool for constructors, designers, carpenters,etc. Specifications: Material: metal Color: silver Length Size: 10in / 15in / 20in （Optional） Measurement accuracy: 1mm Type: Angle ruler Item Size: 10in: 26.5*16*3cm / 10.43 * 6.29 * 1.18in 15in: 39*16*3cm / 15.35 * 6.29 * 1.18in 20in: 52*16*3cm / 20.47 * 6.29 * 1.18in Item Weight: 10in: 150g / 5.29oz 15in: 173g / 6.1oz 20in: 197g / 6.94oz Packing List: 1 * Ruler 1 * Ruler