[Accurate]: With easy-to-read laser engraved scale, the protractor can directly read the angle of the miter saw Perfect for crown molding, trim work, and a variety of other woodworking applications. Miter saw protractor features an "O" shape during operation, ensuring smooth and precise readings on inside/outside angles The miter saw protractor is made of aluminum alloy, which has excellent and wear resistance for a long service life. [Wide Application]: Whether you are a professional or not, the miter saw protractor is your ideal choice. It is suitable for crown molding, mitering, carpentry, plumbing, metal processing and more. Colour:As Shown Material:Aluminum Alloy Package Contents: 2 x Goniometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.