Specially designed to work with Breville 54mm Portafilters and on Breville machines with built-in grinders like Breville Barista Express/Pro, and Barista Touch. This dosing ring funnel will ensure that there is no more mess on your countertop. All coffee grinds will be collected in the portafilter. A special protrusion on the front works similarly to the Breville's portafilter, no changes to your workflow required. ✅Features: - Suitable for 54mm Breville Portafilter: Designed to work with the Breville 54mm Portafilter baskets including Breville / Sage Barista Series BES880, BES878, BES875, BES870, BES840, BES810, BES500, Barista Express, Barista Touch, Barista Pro, Infuser, Duo Temp pro. - Hands-free design: This dosing funnel is well constructed and works perfectly on the Breville 54mm portafilter. With a twisting lock, it attaches securely and is easy to connect and remove. There are grooves that are meant to slide into the chute, then the front tap auto-activates the grinder for a perfect dose. - Avoid mess and waste: This dosing funnel is well constructed and works perfectly on the Breville 54mm portafilter. With a twisting lock, it attaches securely and is easy to connect and remove. There are grooves that are meant to slide into the chute, then the front tap auto-activates the grinder for a perfect dose. - Auto grind and easy to tamp: With this dosing ring, you can activate the grinder with its front tap, allowing your machine’s auto dose feature to work as intended. The ring's inside size is 54mm the same as the portafilter. You can tamp with the dosing ring on. It will not block the tamper. From grinding to tamping the dosing ring can keep coffee from falling out.