IMS Precision Ridgeless Triple Basket - 20/22g Part of I.M.S.'s exclusive "E&B" (Espresso and Brewing) line, this ridgeless triple basket was engineered for Kees Van Der Westen portafilters and group heads, but its 58mm/58.4mm sizing and 28mm depth mean it drops into any standard 58mm portafilter deep enough to accept it. SPECIFICATIONS Average capacity: 20-22g Basket height: 28 mm Outside diameter at rim: 70 mm Body diameter: 60 mm Tamper size: 58 / 58.4 mm Cup rating: 2 Perforated area: 49 mm, 715 precision holes at 0.30 mm diameter, circular conical cross-section Finish: wet vibrofinished with ceramic media, corncob dried, then electropolished COMPATIBILITY Fits: Kees Van Der Westen portafilters and group heads; any standard 58mm portafilter with at least 28mm of basket depth INSTALLATION Drops straight into a compatible portafilter, no tools needed. PRO TIPS The flat, ridgeless bottom isn't just cosmetic, I.M.S. designed it to balance the puck's base-to-height ratio for the full capacity, which helps the puck dry and release cleanly on knockout instead of leaving a wet ring stuck to the basket wall. Before buying, measure your portafilter's internal depth, this basket needs a full 28mm to seat properly; in a shallower basket holder it will sit proud and prevent the portafilter from locking into the group correctly.