Starrett protractor head reversible with smooth finish #490

• Reversible protractor head for combination squares, combination sets, and bevel protractors
• Direct-reading double graduations of 0 to 180 in opposite directions, for accurate reading of angles above or below the blade
• Fits Starrett blades 12″ and longer
• Made of cast iron with a smooth black finish

The Starrett PR-1224S Protractor Head, a reversible protractor head
made of cast iron with a smooth black 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.