This device allows for crushed ice. Disadvantage 1: works with very small amounts (ice by ice). For a drink mojito it takes 12 cubes. For both it takes 24 mojito ice etc. One by one it takes time. Disadvantage 2: no possible adjustment of the size of crushed ice. The result is a crushed ice too thin. The ice melts very quickly obtained when the rum and soda water are introduced Result a mojito with plenty of water and ice!