KOFIHAUS Dosing Ring, Magnetic Funnel for 58mm Portafilters

Sits on top of a 58mm portafilter and holds itself there with built-in magnets, so grounds land in the basket instead of on the counter. The anodized aluminum interior is smooth enough that coffee doesn't cling to the walls, which matters when you're running a WDT tool through it too. Lift it off before tamping.