SUITABLE FOR 54mm Breville Portafilter-Designed to work with the Breville 54mm Portafilter baskets including Barista Express, Pro, Touch, Bambino Plus, Infuser and Duo-Temp Pro. AVOID MESS AND WAST- Coffee Dosing Ring stop wasting coffee and messing up your work top with a coffee dosing funnel all the coffee goes into the portafilter basket, severely reduces the mess and difficulty in loading and tamping. 304 STAINLESS STEEL MATERIAL-MATOW coffee powder funnel is made of premium 304 stainless steel, non-rust nor corrosive, FDA grade material, safe to your familys health. EASY TO CLEAN & USE- 54mm portafilter funnel is dishwasher safe, you just rinse it with water and clean it with brush or sponge; As for use, you simply place the funnel atop of your portafilter while grinding, distributing and tamping, and removed funnel quickly when finished. ATTACH SNUGLY & IMPORTANT NOTE- This funnel sits on the outer rim & allows for tamps. The inside diameter is exactly the same as the portafilter basket, so you can tamp with the funnel on. When using machines such as the Breville Barista Express, the portafilter holder (used to hold the portafilter when dosing/grinding) cannot be used while the funnel is installed.