Stanley Adjustable Quick Square 170Mm Adjustable Permanent markings Suitable as a bevel, protractor or saw guide Easy to use Clear graduations Durable Stanley Adjustable Quick Square 170Mm The Stanley Adjustable Quick Square is designed to provide a quick, accurate, and repeatable means for laying out and cutting the various cuts on common, hip, valley and jack rafters used in roof construction. You can also use a quick square as a make-do level when you find yourself without a proper bubble level. While made for framing carpentry, a quick square can be indispensable in a lot of measuring and marking situations. Features Can be used as a protractor For measuring a line perpendicular to the edge of a board For accurately marking 45° angles Determine roof pitches