The Starrett 505A-12 Miter Protractor is a high-quality measuring and layout tool designed for precision in metalworking projects. Made of durable steel and with a blade size of 12 inches, this protractor is perfect for accurate measurements and layout work. With a weight of 0.4500 and dimensions of 10.500 inches in length and 5.800 inches in width and depth, this tool is compact and easy to handle. The Starrett brand is known for its reliability and accuracy, making this miter protractor a valuable addition to any workshop or manufacturing setting.