Kalita Wave is a well known quality hand brewing equipment series. This stainless filter holder suits the smaller Kalita Wave filters (300ml).
With manual brewing you have the opportunity to control all aspects of the brewing process more precisely to (hopefully) end in a better cup of coffee.
In the case of Kalita, their secret is that the filter holder and filters are flat bottomed. This helps to ensure a more even and stable distribution of the coffee and water.