Easy to : The 51mm coffee bottomless portafilter has a detachable design, making it easy and fast to disassemble, easy to use, and without dead corners. Filter Basket Included: Stainless steel 51mm filter basket is compatible for 51mm filter basket, providing you great using experience. Good Compatibility: This 2 ears 51mm bottomless portafilterer is suitable for EC0310 and most coffee machines with 2 ear portafilter. Stainless Steel Material: The 51mm bottomless portafilter is made of 304 food grade stainless steel, which is environmental, more hygienic and safe, and has the characteristics of oxidation resistance, rust prevention, and durability. Extraction Improvement: The bottomless design helps to observe the column, rate, color, and streaks of the column, identify defects and errors before extraction, and better judge the uniformity of extraction, thereby making the extraction of coffee more delicious and consistent.