Versatile Accessory: This 54mm bottomless portafilter is designed to work with Breville / Sage Barista Series BES880, BES878, BES875, BES870, BES840, BES810, BES500, Barista Express, Barista Touch, Barista Pro, Infuser, Duo Temp pro Enhance Your Espresso Skills: The bottomless design of the portafilter allows you to observe the entire extraction process, making it an invaluable tool for diagnosing espresso extraction issues. Whether you're a beginner or a seasoned barista, this feature enables you to identify and correct extraction problems, improve your techniques, and perfect your espresso-making skills at home Elegant Design: Made of high quality stainless steel and solid ABS, it adds a touch of sophistication to your espresso setup Detachable Bottomless Filter Holder: Detachable design, convenient and quick to disassemble, more easy to use and clean.You can also replace it with another Filter Basket Helpful Tips: To avoid splashing, ensure the correct amount and even distribution of ground coffee. Experiment with different grind sizes to find the perfect balance—not too fine or too coarse. Then, use a coffee doser to compact the grounds evenly for optimal extraction