Swanson Part #S0101
- Speed square, aluminum, black gradations, size 7 inches by 7 inches.
- Five tools in one: a tri-square, a miter square, a protractor, a line scriber and saw guide.
- The Speed Square is constructed of durable heavy-gauge aluminum alloy.
- Includes markings for Swanson's One-Number Method of rafter layout, and is packaged with the Swanson Blue Book of Rafter Length and Roof Construction.