Speed Square w/Black Markings Blue Book SPEED CLIP The Swanson SpeedSquare was first developed by company founder Albert Swanson in 1925. This innovative tool combines 5 tools into 1: 1.Try Square 2.Miter Square 3.Saw Guide 4.Line Scriber & 5.Protractor. The SpeedSquare is die-cast for durability and accuracy. Made of heavy-gauge aerospace aluminum alloy it is built to last. Black-filled gradations stand out against a matte finish for easy reading. The Speed Square includes the SwansonBlue Book of Rafter Length and Roof Construction and also features markings for using the Swanson One-Number Method of rafter layout. The Swanson Speed Square is our most popular product and remains the most trusted square of its kind. Look for the Diamond cutout for genuine Swanson products. Brand Name: Swanson Sub Brand: Original Length: 7.25 in. Height: .875 in. Material: Aluminum Product Type: Speed Square Model: 5-in-1 Width: 7 in. Number in Package: 1 pc Color: Silver