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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
Note that the rubber spring tubes are placed between the clip legs. The 2L, 2.8L, 4L, 5L and 6L clips are supplied with two sets of springs. and rubber tubes. The Model 416 Shaker will accommodate glassware in numbers and sizes. from forty-nine 25 ml flasks to two 6 liter flasks. The Model 430 Shaker. will hold numbers and sizes from ninety-one 25 ml flasks to four 6 liter.