What is a combination square?

What is a combination square?

• A. A sliding square mounted on a steel rule, used to mark a "square" line, find level, or measure
• B. Used to mark 90° angles on metal
• C. Used to dent metal before drilling
• D. Used to scribe arcs

Answer: (A)

A combination square is a versatile marking and measuring tool made from a steel rule with a sliding head. Because the head can be moved and locked in place, you can transfer exact right angles, draw true square lines across a workpiece, check that edges are level or plumb, and take measurements along the rule. This combination of marking straight and square lines, plus level checking and measuring, is why it best fits the described use. Denting metal before drilling and scribing arcs aren’t functions of a combination square. Those tasks belong to a punch-type tool and a compass, respectively, which is why those descriptions aren’t appropriate.

A combination square is a versatile marking and measuring tool made from a steel rule with a sliding head. Because the head can be moved and locked in place, you can transfer exact right angles, draw true square lines across a workpiece, check that edges are level or plumb, and take measurements along the rule. This combination of marking straight and square lines, plus level checking and measuring, is why it best fits the described use.

Denting metal before drilling and scribing arcs aren’t functions of a combination square. Those tasks belong to a punch-type tool and a compass, respectively, which is why those descriptions aren’t appropriate.