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The Starrett ProSite Protractor is designed to take error-prone calculations out of the process of miter cuts, and provide a perfect miter, every time, without that pesky math. Starrett's ProSite Protractor has two scales. The red scale and arrow show the angle for a miter joint, while the black arrows and scale provide the angle to fit a single workpiece to an angle. Simply set your saw to the angle that you read. Upside down or backwards, the reading is always correct. It's from Starrett, so you know it has to be accurate!
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