We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › Also known as a rafter square or triangle square, the speed square, invented by Albert ...

Add Yahoo as a preferred source to see more of our stories on Google. In the realm of woodworking, construction, and DIY projects, the Speed® square is a humble tool. It’s one you might use on every ...

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.