This is still the best way to prep glasses for margaritas. One cavity for a wet sponge (some use water, some lime juice) one for salt, and one for sugar. Wet the glass rim, dip into salt or sugar, and your glass is ready to go.

The best thing about this rimmer is that it closes up for storage in your cooler, or behind the bar.

Purchase here: https://www.posi-pour.com/collections/misc-bar-supplies/products/glass-rimmer