This ingenious ruler is four rulers in one package. The five piece ruler easily snaps together to form a 6 inch, 12 inch, 18 inch or 24 inch length depending on your needs. It has clear and accurate grid markings along with 30, 45 and 60 degree markings. This ruler will become your perfect travel companion as it stores easily in a handy felt bag. It is great when you are at home or on the go.