Also known as a "naked" portafilter, the bottomless portafilter is a useful tool for the emerging barista. With the spout removed, you get an unobstructed view of the espresso extraction. Uneven tamps and channeling are quickly exposed and technique can be corrected accordingly.
This portafilter has been cut in a professional workshop. We are very happy with the quality of the work, as some bottomless portafilters on the market have rough edges where the cut has been made. These have been properly polished and are beautifully smooth at the point of the cut.