Bottomless portafilters are used as a diagnostic tool to improve espresso extraction because it allows the operator to see how evenly espresso is flowing out of the bottom of the basket. Fine tune your barista skills with this unique portafilter. This portafilter, also called a "naked" portafilter, lets you identify off-center extractions, multiple steams, and spritzing, among other issues and gives the best feedback for irregular distribution of the ground espresso. This fully chromed 58 millimeter shot basket is crafted with micro-fine pass through holes and can be used with just about any shot basket available (with a few exceptions) is especially designed to fit Rancilio machines like the Silvia.
This Rancilio bottomless portafilter can be used in the Rancilio Silvia and any of the current and discontinued Rancilio commercial espresso machines that are not lever-based. It holds 58 mm portafilter baskets and will also work with almost any espresso machine with a 58 mm E61 brew group (verify with manufacturer before purchase).