Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? The Speed Square was designed in 1925 as an aid to carpenters framing homes, and ...

Q: My dad passed away, and I was cleaning out his toolroom. One of the strange tools I saved was a large L-shaped piece of flat metal that has ruler markings on it all over the place. I've been told ...