Purpose: Acts as a secondary filter to enhance coffee puck consistency, reducing channeling during espresso extraction. It can also be used in portafilters or as a compatible accessory for certain espresso machines. Material: Made from high-quality stainless steel, resistant to high pressure and heat typical in espresso preparation. Functionality: Retains fine coffee particles for a cleaner cup. Allows natural coffee oils to pass through, contributing to a creamier texture and richer crema. 54mm. The base is designed to work with portafilters and espresso machine models including: Breville. This includes, but is not limited to, the Barista Express, Pro, Touch, Bambino Plus, Infuser and Duo-Temp Pro. 58mm. Compatible: Marzocco, Rancilio, Bezzera, iberital, Expobar, Brasilia, Brugnetti, Futurmat Casadio and more. Key Benefits: Durable and Reusable: Eco-friendly and long-lasting. Improved Flavor: Enhances extraction consistency for a balanced shot. Ease of Use: Simple to incorporate into existing espresso workflows.