Standard-sized (58mm), stainless steel blind portafilter basket for backflushing the group heads on most commercial espresso machines, as well as many home machines such as the Rancilio Silvia, Gaggia Baby, Nuova Simonelli Oscar and E61 group machines like Rocket, ECM, Quickmill and many others.
Loaded up with the appropriate detergent, backflushing is a very effective method to keep your group head & discharge components clean and your espresso flowing well and tasting fresh!