High Quality: 7 inch Aluminum Alloy Carpenters Square, solid aluminum alloy construction for durability. Multi-Function: Use as a square rafter tool for rafter measurements. angle and a saw guide for the cut. Protractors can be used with square saws for cross cutting or diagonal cutting. The combination square can measure or mark an angle from 0 to 90 degrees very quickly, and as a saw guide for 45 and 90 cuts. Easy to use: Carpenters Square measuring angles and tilts, adjust to the required angle, adjust the central lever, tighten the nut positioning to achieve precise positioning, a useful function during repetitive cuts, comes with a conversion table, which is easy to use. Clear and Accurate Scale: Speed Carpenters Square are professionally calibrated prior to production. The scale lines are laser printed, the quick square finish features low glare and a protective powder coating, which is clearly visible, easy to read and wont wear off for a long time. More Applications: The adjustable square as a protractor, miter, metal carpenter square, plotting saw guide, framing square and ruler, it can be used for measuring angles, checking aquare, a saw guide, adjusting the saw, drawing circles, marking boards for tearing, leveling, finding the slope of the roof and so on.