The IMS Big Bang Filter Basket B702TFH21.5BB is a high-precision espresso filter basket designed for 58 mm portafilters. It features an exclusive Big Bang hole pattern that enhances water distribution and promotes a more uniform extraction, helping to reduce channeling and deliver more balanced, flavorful espresso shots. This basket is particularly suited for double espresso doses (~14–16 g) and is suitable for professional and advanced home espresso machines. Key Specifications Model: B702TFH21.5BB Series: Big Bang Compatible Portafilter Size: 58 mm (fits tampers Ø 58–58.5 mm) Recommended Dose: ~14–16 g (double espresso) Height: 21.5 mm Border Diameter: ~70 mm Effective Perforated Area: ~49 mm Number of Holes: 585 in Big Bang pattern Hole Diameter: ~0.30 mm Shape: Cylindrical with flat bottom Design: Ridgeless (no interior ridge, ideal for bottomless portafilters) Material: High-quality stainless steel (precision machined, polished) Origin: Made in Italy