General Pivot-Arm Square-Head Protractor

General Pivot-Arm Square-Head Protractor - Easily set bevels and measure angles with this highly accurate protractor. Permanently etched forward- and reverse-oriented graduations allow you to get a reading from any vantage point. Knurled thumb screw simplifies locking the adjustable arm in place. Ground stainless steel construction ensures professional-grade performance. 3 3/8" x 2" Head - 6" Arm.