High Quality: 7 inch aluminum alloy framing square, solid aluminum alloy construction for durability. Multi-function: used as a square beam tool to measure joists, the angle and guide saw for cutting. Protractors can be used with square saws for cross or diagonal cuts. The combination square makes it very quick to measure or mark an angle from 0 to 90 degrees, and serves as a saw guide for 45 and 90 cuts. Easy to use: the square measures angles and slopes, adjusts to the required angle, adjust the center lever, tighten the positioning nut to achieve precise positioning, a useful function during repetitive cuts, comes with a conversion table, easy to use. Clear and Accurate Scale: Carpenter's Square Speed is professionally calibrated prior to production. The scale lines are laser printed, the quick square finish features a protective low gloss powder coat, which is clearly visible, easy to read and will not wear off for a long time. More d 'applications: The adjustable square as a protractor, miter, metal carpenter's square, plotting saw guide, framing square and ruler, can be used for measuring angles, checking aquare, a saw guide, adjusting the saw, draw circles, mark the boards for tearing, leveling, finding the slope of the roof and so on.