Flying Geese Square Up Ruler from Bloc_Loc eliminates most, if not all of your Flying Geese errors, quickly and easily. The patent pending channel locks onto both seam allowances and slides to square up your Flying Geese. It works on all Flying Geese block methods, so you will never take the top off a Goose again. This ruler makes a finished 4″ x 8″ flying geese block and includes easy to follow instructions.