The LUCCA Dosing Funnel is the perfect portafilter companion—helping espresso grounds land directly into the portafilter, keeping your countertop spotless. The underside of the dosing funnel is magnetized, holding on strong to your portafilter throughout the grinding process. The LUCCA dosing funnel also aids in using a WDT tool, preventing grounds from falling over the sides of the portafilter basket. Compatibility:  58mm size is compatible with all 58mm portafilters 53mm size is compatible with all 53mm portafilters & 54mm Breville portafilters.