Features an outward ridge, which allows a tighter fit to the portafilter clip and a little more room inside for the tamper.
Fits many standard 58mm portafilters on brands such as: Astoria, Bezzera, Brasilia, Conti, ECM, Elektra, Expobar, Faema, Fiorenzato, Grimac, Iberital, Isomac, La Marzocco, Reneka, Vibiemme, Wega and more.
