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Since 1947 Johnson Level & Tool has been developing solutions to help professional tradesmen improve their work. Our products are trusted by professionals worldwide to work more accurately, more quickly and more reliably. The thick edge of Johnson Rafter Squares makes them useful as saw guides and for overhanging boards. Our 12" aluminum rafter square comes with built-in scribe notches and a complete rafter angle square instruction manual including rafter tables, for easy rafter angle measurement.