This device is particularly good for fermentations that require a large population of yeast.  Pilsners (or other beers fermented at low temperautres) or high gravity beers in particular will really benefit from getting high levels of oxygen into the wort at the start of fermentation.

These want kits are an easy way to use get your fermentation off to a good active start.

The wand kit includes the 60cm stainless steel 8mm OD wand and the aeration stone screws into the end using an MFL thread so it can easily be removed for autoclave or dip in acid soluton.