Fangrui Product Details Fangrui Product Details [accurate]: With Easy-to-read Precision Laser Engraved Scale, The Protractor Can Directly Read The Angle Of The Miter Saw 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.