Carpenter's Speed Square
thingiverse
A speed square, also known as a rafter angle square, is a triangular tool that combines the functions of a combination square, try square, and framing square in one. It allows for basic measurements, marking lines on dimensional lumber, and serves as a saw guide for making precise 45 and 90-degree cuts. For more details, visit http://en.wikipedia.org/wiki/Speed_square.
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