In addition to the 5 tips above and the associated product images, there is more detailed product information worth knowing. The inside diameter at the bottom of this espresso dosing funnel is the same as the portafilter. In other words, it's stuck on the outside of the portafilter. So you don't even need to remove the dosing funnel and just use the espresso tamper to squeeze the coffee pack. This design makes it much more flexible and easier to use than other products. It also makes the coffee bed flatter. One more thing, while we use high quality aluminum alloy to make the espresso funnel lighter, not as bulky as stainless steel, we have also drilled the funnel with 8 strong magnetic magnets to help the portafilter funnel securely attach securely to the espresso portafilter and won't fall off easily. Works very well and would recommend adding to your espresso kit as soon as possible. There are many other details that make this espresso tool stand out from the crowd of espresso machine accessories. We have put a lot of effort into improving the experience. We believe it will continue to surprise you as you use it. We always believe that all efforts are worthwhile! As a professional coffee accessories manufacturer, we serve every coffee lover with heart and soul, and we hope you can be one of us. If you have any questions about our products, please contact us, we will reply and solve your problems within 24 hours. Note: When purchasing, please select the correct size of espresso dosing funnel to match the size of the portafilter. Don't put the portafilter funnel into the grinder holder or used it with a lot of movement. The small magnetic particles are designed for easy positioning, helping to hold the funnel in place—not to make it permanently unremovable.