High Quality: The 7 Inch Roofing Square made of Aluminum Alloy, solid aluminum alloy construction for durability.Multifunction: Rafter square tool use for angle measurements and a saw guide for cutting. Protractors can be used with square saws for cross cutting or diagonal cutting. The combination square can do a very quickly measuring or marking angle from 0 to 90 degrees, and as a saw guide for 45 and 90 cuts.Easy to Use: Roofers Square Set can be allowing the measurement of angles and pitches, adjust to the required angel, adjustable the middle lever, tighten the nut positioning to achieve precise positioning, a useful feature when making repetitive cuts, comes with a conversion table, which is easy to use.Accurate Clear Scale: The speed carpenters squares scales are calibrated by professionals before production. The scales lines are laser-printed, the quick square finishing features low glare and protective powder coated, which is clearly visible, easy to read, and will not wear out throng a long time.More Application : The Adjustable Set Square as a protractor, miter, line scriber saw guide, framing square and a ruler, it can be used to measuring angles, check for aquare, a saw guide, adjust sawa, drawing circles, mark boards for ripping, leveling, finding roof pitch and so on.