1. Compatibility This 58mm Bottomless (Naked) Portafilter with 3 ears is designed to work with CASABREWS/Gevi and other espresso machines that use a 3Ear 58mm Portafilter. 2. Stop Channeling and improve extraction This bottomless design lets you observe the flow column, flow rate, color, and flow stripe patterns to identify defects before extraction and better judge the uniformity of extraction, helping you achieve more delicious and consistent espresso. 3. Filter Basket Included A stainless steel 58mm filter basket is included and is compatible with the original filter basket. 4. 304 Food Grade Stainless Steel The Bottomless Portafilter is made of foodgrade stainless steel (304), ecofriendly and nontoxic, more sanitary and safer, with oxidation resistance, corrosion resistance, rust resistance and durability. 5. Wooden Handle Smooth wooden handle with ergonomic design provides a comfortable grip. 6. Use scenarios Home espresso dialing in shots: use the visual feedback from the bottomless portafilter to adjust grind size, dose, and tamp for even extraction. Barista training and demonstrations: show proper puck prep, distribution, and tamping, and identify channeling in real time. Compatibility testing and comparisons: test performance with CASABREWS/Gevi machines and compare against the original basket to evaluate results.