Starret Protractor Head for combination squares
The Starrett Protractor Head is a protractor head made of cast iron with a black wrinkle
finish, attaches to combination squares, combination sets, and bevel
protractors and fits Starrett blades 12" and longer. It has revolving
turrets with direct-reading double graduations, 0 to 180° in opposite
directions, for accurate reading of angles above or below the blade. The
protractor head is reversible, with shoulders on both the front and
back for reading on both sides.
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.