A bartender staple, this two-piece stainless steel Boston shaker is perfect for thoroughly combining ingredients and getting cocktails perfectly cold. Simply measure out spirits and flavorings into the smaller container, add ice cubes and top with the larger container to form a tight seal. Then flip so smaller container is on top and shake like crazy for 10 to 15 seconds. When finished, separate containers and serve. A stamped maximum fill line prevents overfilling.