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 ...

To be successful. carpentry projects must be square, level, and plumb. Square means that corners are 90 degrees. Level is always gauged by a device, such as a carpenter's level, but level does not ...