The Coley Jigger shakes up the world of mixology with its unique double-measure design. This unique measure takes its name from Ada "Coley" Coleman, one of the best known bartenders of the 1920s. Inspire your mixology with this reference to the golden era of cocktail invention. The handle between the measuring cups gives greater grip, and interior lines denote 15ml, 25ml and 45ml. No lightweight jigger here -- it weighs a full 4.25 ounces.