Square head protractor.
Preferred choice of machinists, draftsmen and mechanics.
Used for setting bevels, measuring and transferring angles.
6" adjustable protractor arm locks into desired position with knurled thumb nut.
Permanently etched graduations from 0 to 180 degrees and from 180 to 0 degrees.
Head measures 3-3/8" x 2".
Made of ground stainless steel.