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A square is used to lay out an accurate angel. A square is also a test gauge for checking an existing part.
The smallest square, the try square is used to "try" the squareness of surfaces and edges and to law out lines at right angles to an edges and to lay out lines at right angles to an edge. Some can check a 45 deg. angle. Try squares are available with blades 6 to 12 in. (15 to 31 cm) long. Handles are of metal or wood (usually crass-trimmed).The head of the square almost always has a level tick for easy layout of plump lines and horizontal lines.
A third square is the carpenter´s square. The carpenter´s square is used to lay out roof rafters and stair framing. The home mechanic will need it only for projects involving large objects.
The squares require a little care. If a try square is dropped, it may not keep its accuracy. This is more pronounced than for the combination square, since the combination square relies on a wide sliding area.
Keep the combination square away from electrical sources or the parts may be welded together.
To maintain steel surfaces, some tool owners use lemon oil furniture polish. The lemon oil protects and lubricates without attracting dirt.

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