A Speed Square, also a rafter or triangle square, covers many uses. Understand how to use a Speed Square and how it can be used in various home improvement DIY projects. Here are a few of those ...

How to Use a Rafter Square The Rafter Square, or Speed Square, does more than mark perpendicular lines. Here's how to make sense of all the numbers on your square and get the most out of this tool.

Level The Swanson Speed Square can sub in as a level in a pinch. If you’ve got a plumb bob, you can use that to determine if something is level by measuring it in comparison with the 45-degree mark.