The Winco J-5 Double Jigger is a bartender tool designed for precision in measuring cocktail ingredients. With a capacity of 2.0 oz, this jigger allows for accurate pouring of liquids for cocktails. The model, Winco J-5, signifies a specific design from the brand Winco, catering to professionals in the bar and beverage industry. This tool is essential for creating consistent and high-quality cocktails for customers.