Machinist precision steel squares have two legs set at a fixed angle to measure and mark inside and outside angles of a specific size. They guide measurements, markings, and cuts, and they are sometimes stood on end for vertical applications.

Machinist precision steel combination squares lay out 90° angles with their anvil, lay out 45° angles with their shoulder, and check level and plumb with their bubble vials. Also known as precision combo squares, these multifunctional tools assist with gauging flatness, aligning tool blades and fences, setting bevel angles on saws and jointers, striking long lines on workpieces, and more. They include a square head but also accept other types of compatible heads to perform additional measurement and layout tasks.

Machinist precision steel combination square sets include interchangeable heads for different measurement and marking tasks. Their square head lays out 90° angles with its anvil, lays out 45° angles with its shoulder, and checks level and plumb with its bubble vials. It assists with gauging flatness, aligning tool blades and fences, setting bevel angles on saws and jointers, striking long lines on workpieces, and more. Their other heads perform more specialized functions such as finding center and measuring a large range of angles.