ACAIA Portafilter Dosing Cup Compatible with a 58 mm portafilter, the dosing cup allows for an efficient and tidy transfer between the grinder and your portafilter. It helps baristas achieve a more precise dose with minimal waste. The small size option is Acaia's newest and smallest doing cup that has shorter design than previous dosing cup and new fully circumferencing lip for compatibility with more grinder models. Made if food-grade 304 stainless steel. Anti-static finish to minimize coffee grind residue. Compatible with the Mahlkönig EK43, with a quick slip in and out feature. Allows a fast and efficient transfer of grounds to the portafilter without the use of a dosing funnel.