1、Applicable Models: 51mm coffee bottomless portafilter is suitable for DONLIM KF6001 KF7001 KF8001 KF5002 CM4621 CM421 CM4219 CM4278 CM4008D, for Petrus, for Bear, for EUPA, for ACA, for Morphyrichards, for HOMIX, for GYPAS, for SACHI, for NIKAI, etc. 2、Premium Material: The 51mm coffee portafilter is made of ABS and zinc alloy material, oxidation resistance, corrosion resistance, rust resistance. 3、Fine Filter: Ultra fine hole single layer filter is the key to extract coffee fat, making more delicious coffee. Ergonomic design, comfortable grip. 4、Removable Design: The detachable design is convenient and quick to disassemble, easy to use, and easy to clean without dead corners. 5、Bottomless Portafilter: The bottomless design can help observe the flow column, flow rate, color, flow column stripes, etc., find the defects and errors before extraction, and better judge the uniformity of extraction.