Get a better grip on your carboys. Minimizes the risk of mishandling. Makes it easier to drain your carboys of cleaners and sanitizers. Fits ribbed carboys, 3, 5 and 6 gallon size. NOTE: These handles are not designed to handle the weight of a full carboy. When lifting, always support the weight of the carboy with one hand underneath. As always in brewing, caution is the rule of the day.