58mm VST Ridgeless Filter Basket 20g for Portafilter Handle Commercial Use.
Features VST's new precision filters deliver consistent extraction performance over a wide range of concentration with reduced sediment. Designed to extract properly as a ristretto, normale or lungo with minimal or no change in grind setting at a fixed dose. Filters are matched for total square area to +/- 5% to ensure identical performance(typical variances of standard filters range from 50-200% of nominal).
All VST Filters are WARRANTED for ONE-YEAR and for ZERO DEFECTS and 100% of VST's filters are inspected on the VST Digital Filter Imaging System. Holes are fabricated using a new micro-machine and finishing process100% of holes are measured on every filter for min/max range limits on area and diameter to a precision of +/- 20 µm (QC report provided with every filter)All holes are measured for circularity placement square area and blocked holes. Hole pattern is centered to +/- 1.0 mm and placement is oriented for uniform extraction throughout the entire puck. Wide outlet angle to prevent filters from clogging anti-wear design ensures uniform performance for life of product.