Wide range of application: This coffee dosing ring is suitable for 51mm portafilter, particularly compatible with such as EC680 EC685.(IMPORTANT: Please measure your portafilters before purchasing. This product is only for handles with an inner diameter of at least 51mm portafilters.)Exquisite craftsmanship: The portafilter accessory is flawlessly crafted and comes without burrs or manufacturing defects.The aluminum material will not rust.Thanks to small magnets, the ring fits perfectly and doesn't wobble on the mill.Avoid waste: The espresso dosing funnel is inserted into the portafilter and then sits firmly.It significantly reduces the annoying scattering of ground coffee when grinding directly into the portafilter.It is particularly helpful with statically charged powder.Material: This dosing ring is made of aluminum, stable and durable.The surface is matte and looks smooth, bright, aesthetic and feels comfortable. (Suitable for 51mm iron portafilter).It is ideal for coffee machine, easy to carry.Easy to use and wash: With a little shaking, coffee from the espresso funnel cannot fall out and distribute well, then the dosing ring can be removed.It can be quickly cleaned with brushes, sponges, dishwashers, etc.