• As the name indicates, these tools can be used for many different purposes - a complete substitute for a whole set of common solid try squares, a 45 degree miter, a depth gage, a level, a plumb, and by withdrawing the blade it can also be used as a precision rule.
• A choice of smooth-finished forged and hardened (longer wearing) steel square head and center head, or a cast iron square head and center head. All bearing surfaces are accurately ground.
• A choice of stable cast iron protractors - reversible or non-reversible style.
• Protractors are furnished as reversible, with shoulders on both sides of the blade, or non-reversible, with a single shoulder on one side of the blade only. All protractors also have a spirit level.

• Protractor heads have revolving turrets with direct-reading double graduations, 0-180 degrees in opposite directions. This permits the direct reading of angles and supplementary angles.
• Most square heads have a handy spirit level and a hardened scriber.
• Square blades are machine divided, hardened and tempered.
• Square blades and protractor heads come in a choice of regular or Starrett no-glare satin chrome finish.
• A reversible lock bold allows the blade to be turned over or end-for-end, without removing the lock bold or nut. This ensures true alignment of the blade and heads.
• Square blades feature easy-to-read, sharp graduations and aver available in many convenient sizes.
• Separate parts and attachments available

Commonsense Tips for Using Squares and Center Heads:

• First, make sure your square is clean and that is is located against a flat surface - burrs on metal or knots and bumps on wood will throw squares off.
• Second, to scribe a line, the steel scriber can be used on any material, but usually on metal. A carpenter's pencil is normally used on wood, but if finer lines are needed, a light cut with a utility knife may be used. This is also handy when scribing cross grain.
• Third, when using a center head on a piece that may not be completely round, it is good practice to scribe more than two intersecting lines.