The Big 12 is seven tools in one! It's a:

• framing square
• try square
• miter square
• protractor
• saw guide
• stair gauge
• and out-of-square corner angle finder!

 It's constructed of heavy-gauge aluminium alloy and includes the Layout Bar for use in determining out-of-square corners. 

Also included are the Swanson Blue Book for roof and stairway layout and layout bar with hardware.

• SKU SWANSON BIG 12 SPEED SQUARE WITH LAYOUT BAR