58mm Group Coffee Machines Portafilter VST Precision 18gram Ridgeless Double Filter Basket Note: This Basket Has No Locating Ridge Experience uniform extractions across all groups for the first time - permanently. The essential espresso filter for those in search of the ultimate cup. Suits most E-61 group heads and any group that measures 60mm in diameter and work with a tamper 58.3mm. Dosing capacity is from 17-19 grams. Recommended for use with the following machines: La Marzocco, Synesso, Nuova Simonelli, Faema, La Cimbali and Rancilio with standard portafilters. Also compatible with the La Marzocco SWIFT Grinder. Basket Height 24.2mm. NB: check the measurement of your current baskets and handles to assure correct fitting VST's new filters deliver consistent extraction performance. - All VST Filters are warranted for ZERO defects! - 100% of holes are measured on every filter for minimum and maximum range limits on area and diameter - All holes are measured for circularity, placement, square area and blocked holes - Filters are matched for total square opening to +/- 5% to ensure identical group-to-group performance (typical filters vary from - 50 to +100%)