The original Swanson Speed Square has been an indispensable tool for tradesmen since 1925 and is designed and manufactured specifically to incorporate features of framing squares, tri, miter, and protractor squares. In this collection of three squares, you get the best options for any project. The Speed Square and Big 12 Speed Square and Speed Trim Square are all proudly made in America, forged from aluminum alloy. Each has practical, functional uses on every job site – and home improvement projects too. These three squares share features that are used by every tradesperson: common rafter and hip/valley rafter scales that permit one-number references for all cuts. The square is merely rotated to the proper roof pitch value on either scale to assure the correct angle cut. The slot along the scales will accommodate an adjustable locking pin for repetitive cuts using any 1/4-inch bolt and nut. The Big 12 and Trim Square include additional features that make this unique set of three Swanson Speed Square an indispensable part of every tool collection.