The Brown & Sharpe 599-490-108 is an 8-inch replacement blade for the 599-490-8 Angle Protractor and is made of tempered stainless steel for durability, and can be used as an 8-inch or 200-mm blade, measuring from 0 to 180 degrees. It can be used to replace lost or damaged blades, for convenience. Made in Switzerland. Angle protractors are used to properly measure the angle of a surface or line on a drawing, and require a blade. Brown & Sharpe manufactures precision measuring equipment and metrology hand tools. The company, founded in 1833, played a key role in setting industrial standards in the United States. Brown & Sharpe was acquired by Hexagon Metrology in 2001 and is headquartered in North Kingstown, RI.