Squares & Combination Squares

Squares verify 90‑degree angles and mark perpendicular lines.  Try squares, engineer’s squares and combination squares ensure accuracy in joinery and machine setup.  Combination squares include 45‑degree and 90‑degree references, depth gauges and scribers.

What are squares and combination squares used for?
A square is used to check or mark 90° and sometimes 45° angles in woodworking, metalworking, and construction. A combination square adds versatility with a sliding ruler, level vial, and scribing pin, making it useful for measuring, marking, and setup work.

How do I know if my square is still accurate?
Place the square against a straight edge, draw a line, then flip it and check if the line matches. If there’s a gap, the square may be out of alignment and should be adjusted or replaced.

What are the benefits of a combination square over a fixed square?
Combination squares allow for adjustable measurements, can check both 90° and 45° angles, and often include built-in measurement scales. They’re ideal for versatile layout work, while fixed squares are usually sturdier and simpler for repetitive use.