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