This stirrer is suitable for brews up to 25 Litres in volume. Paddle will be at least 45cm long, exact product will vary depending on the supplier
It is very important to make sure your brew is well stirred and "aerated" before the yeast is added. If not well stirred then yeast growth will be retarded and brews will not ferment as well as intended.
Stirrer should always be cleaned and then sterlised before each use.