1.: The 7 Inch Rafter Square is made of Aluminum Alloy, solid aluminum alloy construction for durability. 2.Multifunction: Rafter square tool is used 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¡ã and 90¡ã cuts. 3.: Rafters 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. 4.Accurate Clear Scale: The carpenters squares scales are calibrated by professionals before production. The scales lines are laserprinted, 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.