Precision Fit 49MM Size: Designed to match 49MM coffee portafilter dimensions, this dosing ring fits securely with brewing bowl and powder basket setups, aligning grounds neatly to forestall spillage during preparation LongLasting Aluminum Build: Crafted from robust aluminum, this dosing ring withstands daily use without deforming, offering a balance of light weight and stability for consistent coffeemaking routines at home or in cafes Effortless Installation And Removal: Simple insert and lift design makes it quick to attach or remove from the portafilter, allowing smooth workflow when grinding, tamping, and brewing espresso based drinks Magnetic Attachment Mechanism: Integrated magnets hold the dosing ring firmly in place during dosing, minimising mess and guaranteeing even distribution of grounds for improved extraction results Use scenarios Home espresso setup with a 49MM portafilter, where the dosing ring keeps grounds contained and aligned to prevent spill during dosing and transfer Busy cafe workflow, where the durable aluminum construction withstands daily use and the magnetic attachment maintains position for precise dosing with minimal mess Barista training or practice sessions, enabling quick install and removal to repeat dosing cycles and ensure consistent ground distribution for learning and skill development