Lee Valley 9" Protractor Square
Although very handy as a long-armed protractor for measuring inside or outside angles, this tool excels as a cutting guide. Without calculating anything, an angle can be duplicated perfectly. It is ideal for angled cuts in numerous situations. Check the angle, lock the protractor, and make your cut. Hard anodized aluminum with plated-steel fittings. The protractor is graduated to 180°, reading left to right and right to left. The arms are 20" and 9" and are graduated in 16ths and millimeters.