About This Professional and Simple: This 51mm espresso bottomless portafilter external clamp-on funnel perfectly fits most mainstream 2-ear and 3-ear bottomless portafilters on the market. It seals tightly against the edge of the portafilter basket, enabling stable alignment without extra adjustments and preventing coffee grounds from spilling due to ill-fitting sizes. Easy to install, remove, and maintain Premium Materials: Espresso dosing funnel 51mm is made of durable aluminum alloy, with powerful magnets, firmly adsorbed on the mobile filter, fixed without gaps, prevent slippage and looseness, waterproof and rust-proof, easy to maintain, not easy to scratch, no odor Easy Storage and Material Quality: 51mm Espresso Dosing Funnel. Made of high-quality aluminum, it is lightweight with moderate hardness—resistant to deformation and wear. Its smooth surface has no dead corners; after use, residual coffee grounds can be easily removed with a dry brush, no complex cleaning needed. it features strong magnetism that firmly adheres to the portafilter, with gap-free fixation to prevent slipping and loosening. It is waterproof, rust-proof, easy to maintain, scratch-resistant, and odor-free Designed for wide compatibility: it works with most Express Home Barista 51mm bottomless mobile portafilter adapters for espresso, including coffee machines like the EMCP50, EC-680M, EC685, EC702, ECP3420, and ECO 311. The 51mm mobile funnel offers coffee enthusiasts portable coffee service, enhancing extraction, flavor, and efficiency Practical Protective Accessory: The silicone mat paired with the funnel securely holds the portafilter, while preventing scratches caused by direct contact between the metal portafilter, tamper, distribution screen, espresso tamper, spring-loaded calibration tamper, and the workbench. It saves space, offers anti-slip, scratch-resistant, and heat-resistant properties. When combined with WDT tools, it forms an espresso accessory kit—easy to maintain, odor-free, washable, and integrating both practicality and protective functions