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A glass rimmer is a bar accessory used to apply salt or sugar to the rim of a glass. It usually consists of one or more shallow plastic or metal discs that the glass is turned upside down into. The discs can be filled with either the rimming salt or sugar, or sometimes something to moisten the rim of the glass such as lime juice.
The purpose of rimming the glass can either be for aesthetics or to enhance the flavor of a cocktail. Rimming usually crosses both categories. Adding something to the rim of the glass is very visually appealing and therefore ornamental, but with proper selection it can substantially enhance the flavor of the drink.
Some bartenders choose to prepare several rimmed glasses in advance. re-rimmed glasses save time on preparation.