Premium 58mm bottomless portafilter for Rocket espresso 21g ✔️ 21g basket; Made in Italy; silver finish; barista-grade upgrade This 58mm bottomless portafilter is designed to fit Rocket espresso machines, delivering a clear view of the extraction to help dial in grind, tamp, and dose for consistent shots. ✅ 58mm bottomless design for real-time extraction view ✅ Compatible with all Rocket espresso machines ✅ 21g basket included for standard dosing ✅ Made in Italy with silver finish and barista-grade upgrade 💡 What is a bottomless 58mm portafilter used for in espresso extraction and shot tuning for better results? Handy explainer for coffee hobbyists looking to dial in shots. see channeling and flow so you can dial in grind size and tamp pressure observe crema and extraction speed to keep shots consistent works with standard 58mm baskets and Rocket machines made in Italy with durable metal construction ✝️