- 51mm coffee dosing ring with magnetic system that improves stability and reduces ground coffee dispersion - Compatible with 51mm and 58mm portafilters, making espresso coffee preparation and tamping easier - Made of high-quality aluminum alloy, resistant to corrosion and wear - Helps save ground coffee and keep the workspace clean, preventing mess and waste - Easy to use: place it on the portafilter during grinding and tamping, and remove it when finished - Quick and easy cleaning with a brush or sponge - Essential accessory for baristas, coffee shops, and espresso coffee lovers at home