Speed square
Triangular tool used by carpenters / From Wikipedia, the free encyclopedia
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A speed square, also called a rafter square, rafter angle square, and triangle square, is a multi-purpose triangular carpenters' tool used for marking out. Its functions include many of those of a combination square, try square, and framing square. Carpenters use it to make basic measurements and mark lines on dimensional lumber, and as a saw guide for short 45 and 90 degree cuts.
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The term "speed square" is a genericised trademark based on those owned by Swanson Tool Company[1][2] which first manufactured and sold the tool.