With beautiful Italian craftsmanship and a perfectly weighted chrome tipped handle this bottomless portafilter from Quick Mill is a great addition to any home espresso machine with an E61 group head. 

A bottomless portafilter, also known as a naked portafilter, is a modification of the portafilter used in espresso machines. It is characterized by the absence of the bottom spout and features an open bottom instead. 

One of the benefits of using a bottomless portafilter is the visual feedback you gain when pulling an extraction. The open bottom of the portafilter allows you to observe the espresso extraction process more closely. You can see the coffee flowing out of the basket, enabling you to assess the extraction quality, including the color, thickness, and consistency of the espresso stream. This visual feedback can help identify issues such as uneven extraction, channeling, or improper grind size.