Bottomless 58mm Portafilter for E61 Group Espresso ✔️ 58mm bottomless portafilter for E61 group; includes filter basket This bottomless 58mm portafilter is designed for E61 group espresso machines and is compatible with Rancilio Expobar Rocket Espresso machines. It includes a filter basket and is factory cut for pro-grade espresso. ✅ 58mm bottomless portafilter for E61 group ✅ Compatible with Rancilio Expobar Rocket Espresso machines ✅ 2 Ear design for secure seating ✅ Includes filter basket for immediate use ✅ Factory cut for pro-grade espresso 💡 What is a bottomless 58mm portafilter used for in E61 group espresso machines? It's a handy tool for visually checking extraction and diagnosing tamping or grind issues. - handy visualization of extraction flow for E61 group heads - helps spot channeling and uneven tamping in 58mm setups - great for dialing in grind size and dose for consistent shots - compatible with 58mm bottomless portafilters on Rancilio Expobar Rocket machines ✝️