Onhand High Quality Double Jigger Measure Cup - Polycarbonate Resin - 20cc small jigger - 40cc large jigger A jigger is a common bar essential that acts as a cocktail measuring cup. Jiggers are dual sided and help bartenders cut down on over pouring and remain consistent when crafting cocktails. They have different capacities on each end and range from 5 cc to 40 cc in liquid measurement