This Swanson Carpenters Speed Square (Imperial) is an innovative tool which combines 7 tools into 1. 1. Try Square 2. Miter Square 3. Saw Guide 4. Protractor 5. Framing Square 6. Stair Gauge 7. Out of Square Corner Angle Finder Constructed of heavy gauge aluminum alloy. SpecificationsLength: 12"Product Material: Aluminium Features and BenefitsConstructed of heavy gauge aluminum alloy1/4" and 1/2" spaced notches to facilitate scribing linesMatte finish to prevent glarePlain gradationsGreat for deck framing and stairway building