The Swanson Speed® Square and the “One Number”sm method of determining the angular pitch of a roof were first developed in 1925 by a carpenter name Albert J. Swanson. As his fellow tradesmen began to appreciate the ingenuity of his idea, they wanted their own Speed® Square. Swanson began to hand make the squares to fill the requests for the tool. Today, Swanson® Tool Company continues to proudly manufacture and distribute the Swanson Speed® Square and other fine carpentry tools from its headquarters in Frankfort, Illinois. Under the direction of the Allemand Family the Swanson® product line has been upgraded and expanded to meet the changing needs of its contractors and do-it-yourself enthusiasts.Shop All Swanson Tool Co ProductsVisit Swanson Tool Co Website