Features: 1. Compatibility: This 3-ear portafilter with 51mm diameter is designed for Donlim 6001 5403 KF5400, Petrus 3606 3690 3366 (not compatible with PE3320 or Donlim KF600 KF6001), Maxims MKA71 KF500S KF5002 KF7001 KF8001 CM4621 CM4218 CM4219 CM4008D, SEVERIN, DERLLA, GULISSO, Stelang, and most other 3-ear 51mm commercial espresso machines. 2. Filter Basket Included: Stainless steel 51mm filter basket compatible with Donlim 51mm portafilters. 3. Extraction Improvement: Bottomless design allows observation of flow column, flow rate, color, and streaks to detect inconsistencies before extraction, helping achieve more even and flavorful espresso. 4. Premium Material: The bottomless portafilter is constructed from stainless steel, offering durability, rust resistance, and hygienic performance. 5. Detachable and Easy to Clean: Features a detachable design for easy disassembly and thorough cleaning without hard-to-reach areas. Specification: Item Type: Portafilter Weight: 330g / 11.64oz Material: Stainless Steel Product Size: Approx. 23 x 5.1cm / 9.1 x 2.0in Compatible Models: Donlim 6001 5403 KF5400, Petrus 3606 3690 3366 (not for PE3320 or Donlim KF600 KF6001), Maxims MKA71 KF500S KF5002 KF7001 KF8001 CM4621 CM4218 CM4219 CM4008D, SEVERIN, DERLLA, GULISSO, Stelang Package List: 1 x Portafilter