The Fowler 52-440-612 Bevel Protractor is supplied with 6" and 12" blades and has a magnifier lens for the vernier scale and dial reading. The dial is graduated over 360° in 0° to 90° sectors, rotates around the full protractor head, and provides readings to 5 minutes of arc on the vernier scale. The blade has beveled ends (one 45° and one 60°) for fitting in tight spaces, slides the full length, and is fastened by a knurled thumb lock. The base, blades, and angle attachment are made of hardened stainless steel. Fowler, an American company, manufactures premium inspection and measuring instruments like electronic indicators, calipers, bore gages, and micrometers. The company, founded in 1946, is headquartered in Canton, MA.