These ingenious rulers are four rulers in one package. The five piece ruler easily snaps together to form a 6", 12" 18" or 24" length. It has clear and accurate markings along with 30, 45, and 60 degree angle markings. You'll love it at home or on the go, with its sturdy felt carrying bag. For storage, it is recommended to snap the small end cap onto a larger piece so it does not get lost.