Features and Benefits:�Solid aluminum extruded square will not bend or break�Includes conversion tables that are stamped�Mark or cut boards up to 12 in. wide�Thicker frame design ensures safe use as a saw guide�Graduated notches for pulling layout lines�Includes helpful instruction manual with complete rafter tablesThis 12 in. heavy duty rafter square is made of solid extruded aluminum that will not bend or break. It has stamped conversion tables. This square enables you to mark or cut up to 12 in. boards. The thicker frame ensures safe use as a saw guide. Instructions are included.