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.

In this video, learn how to utilize speed squares effectively for creating consistent lines along a straight edge. #diy ...

PITTSBURGH, Aug. 7, 2025 /PRNewswire/ -- "I work in construction, and I thought there could be a speed square with multiple integrated levels," said an inventor, from West Palm Beach, Fla., "so I ...