Overview The IMS Competition Convex Filter Basket is engineered for 58mm bottomless portafilters, featuring a convex bottom that directs water flow toward the center. Its ridgeless interior, paired with 715 micro-holes, supports a steadier extraction and balanced flow during the pull. Design and compatibility Crafted from stainless steel AISI304 with an electropolished finish, this basket is food-safe and built to endure daily use. Made in Italy, it is designed to fit most E61 group head machines and works with common 58mm dosing workflows, including popular brands that customers rely on. Convex bottom concentrates flow toward the center Ridgeless interior for smoother water movement 715 perforations balance extraction across the basket Fits most 58mm bottomless portafilters Designed for 58.5 mm tampers Border: Ø 70 mm; Body: Ø 59 mm; Internal diameter indicated Stainless steel AISI304; Food safe; Electropolished surface; Made in Italy Real-world use and benefits For 18g doses, the convex design guides the shot toward a centered, steady pour. The configuration may help maintain a stable flow and deliver a consistent crema across pulls, making it suitable for both home setups and busy cafes aiming for repeatable results. Encourages centered extraction for a uniform shot profile Supports consistent pours across different grinders and tamping styles Durable stainless steel construction is easy to clean Widely compatible with common 58mm bottomless portafilters and E61 groups Care and maintenance Rinse after use and wipe the interior to preserve the electropolished finish. Regular cleaning helps maintain performance and keeps daily maintenance straightforward. FAQ Q: Which espresso machines is this IMS convex filter basket compatible with? A: Fits most 58mm bottomless portafilters and many E61 group heads, including common brands listed in the specs. Q: What design benefits does the convex bottom offer? A: Concentrates water toward the center for potentially more balanced extractions and crema.