Extraction Improvement- Use a 54mm bottomless portafilter to really see whats happening under the hood, You can even clearly see the flowing golden espresso extract, whether your grind is wrong or you are tamping incorrectly the bottomless portafilter will let you know. A great tool for beginners and experts Ergonomic design - ergonomically designed to ensure perfect grip and easy manual control; the strainer head is cast from food-grade stainless steel, hand-polished and precisely dimensioned to ensure that the strainer is firmly engaged IMPORTANT NOTE - Our portafilters are designed to fit snug into the group head, providing a tight seal when brewing. However, due to the varying tolerances between machines, some may fit more snug than other. In the rare case that you experience fitment issues, please reach out to our team directly Removable & Easy to Clean-The detachable design is convenient and quick to disassemble, easy to use, and easy to clean without dead corners.