Kraft's 7 in. Aluminum Rapid Square w/ Manual features 5 tools in 1 including a try square, miter square, protractor, inscriber, and saw guide. Strong construction won't bend or break. A hang hole in the blade for easy storage. An instruction manual is included. The instructions manual includes how to use the square for all rafter types including common, valley, hip, valley jack, hip jack, cripple jack, and dormer rafters. Charts are provided to determine rafter lengths based upon popular rise, pitch, and degrees.