What is the name of this essential carpentry tool?

Answer Square

It may look like something from your 7th grade geometry class, but the humble carpenter square is an absolutely vital tool in the carpenter's tool bag. When it comes to measuring a perfect 90º angle, nobody's come up with a high-tech device that does a better job than the square. Experts recommend the 6" size for portability and ease of use caution that plastic models can lose their shape and wreak havoc down the road. Stick with metal.

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