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 ...

We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › Also known ...

Speed squares are a helpful saw guide for cutting 45- and 90-degree angles. The plastic squares are thicker than most metal ones, making them a good fence for the shoe of a circular saw to ride along.