within the indicator arm is a 90 degree arm that slides left to right and rides up and down allowing the seat cut and soffit cut having different size measurements on this arm is measurements 1 u2033 to 12 u2033 on top and bottom the device of the present invention is for left and right handed people fig2 is an orthographic view of the present invention 10 in use the present invention 10 is a rafter square 10 for laying out roof rafters 12 calculating and marking out the length of ridge cut bird cut seat cut fascia and soffit cut and for pitches for common hip and valley required cuts of rafters 12 having a pivotal locking indicator arm that rotates about a pitch indication guide which is located on both sides left and right of being at square position upper pitches for common rafters 10 and lower pitches for hip and valley rafters 10 a sliding pivotal locking indicator arm is 1 u2033 to 18 u2033 on right and left side with measurements and rides up and down for different size material from 2 u2033 u00d7 6 u2033 to 2 u2033 u00d7 12 u2033 lumber within the indicator arm is a 90 degree arm that slides left to right and rides up and down allowing the seat cut and soffit cut having different size measurements on this arm is measurements 1 u2033 to 12 u2033 on top and bottom the device of the present invention.