The Starrett C33-1224 Center Head, made of forged hardened steel with a smooth black enamel finish, attaches to combination squares, combination sets, and bevel protractors to accurately locate the center of cylindrical or square workpieces. It fits blades 12", 18", 24", 300mm, 600mm, or longer on Starrett combination squares (except the 33J series and 8 series), combination sets, and bevel protractors
Protractors are tools that measure specific angles, which allow users to create and replicate desired angles. The tools include a stationary base and movable rule, usually connected by a scale that may be digital or manual. They are useful in a wide range of applications, such as measuring crown molding and installing baseboards. A protractor can be included as part of a combination set, along with a center and a square. A center accurately locates the center of a circle or cylindrical rod. A square is used to scribe right angles and parallel lines, calibrate miter and table saws, or as a miter, height gauge, or depth gauge.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.