Combine all the dry ingredients on a plate that will comfortably fit your glasses when turned upside-down.
Working with one glass at a time, rub one of the lime wedges all the way around the rim of the glass. Turn the glass upside-down and tap into the chili salt mixture until you have the desired amount of salt around the rim. Repeat for each glass.
Store any remaining mixture in an airtight container in the refrigerator for up to two weeks.