A speed square is handy for marking cuts, finding angles, and more. Here are a few good reasons why no toolbox should be without one.

To mark a parallel line, press the square's fence tight against the board's edge, then place the pencil tip into the appropriate notch.

You can use a Speed Square to build sheds, firewood racks, picnic tables, Adirondack chairs, benches, saw horses, even a boat. You name it, and a Speed Square will help you make it.