This Swanson Carpenters Speed Square (Imperial) is an innovative tool which combines 5 tools into 1. 1. Try Square 2. Miter Square 3. Saw Guide 4. Line Scriber 5. Protractor This Speed Square is die-cast for durability and accuracy. It is also made of heavy-gauge aerospace aluminum alloy, meaning it is built to last. The black-filled gradations stand out against a matte finish for easy reading. SpecificationsLength: 7"Product Material: Aluminium Features and BenefitsEssential for every carpenter, construction professional, roofer, and DIYer1/4" spaced scribing notches and the Diamond cutout for easy rafter seat cuts and scribingGradations included for marking common, hip, valley, and jack raftersHeavy-gauge billet aluminum alloy construction is die-cast for increased accuracyHigh-visibility, black gradations with a non-glare, matte finish for easy reading