Bar jiggers always have two sides to them; although when it comes to bar service, this is considered a good thing. Each side of a jigger measures a different amount, meaning that a bar tender can quickly and easily measure two different quantities of alcohol using the same device. Typically made of durable stainless steel, bar jiggers are important to any bar service. Bar jiggers help bar tenders, both amateur and professional, pour the correct portions of liquor. There is always a larger side and a smaller side to a jigger, making it quick and easy to transition from pouring one amounts to another. Bar jiggers are also useful to practice with, to make sure that a bartender's pour style is actually accurate.