1、Extraction Improvement: The bottomless design helps to observe the flow column, flow rate, color, and streaks of the flow column, identify defects and errors before extraction, and better judge the uniformity of extraction, thereby making the extraction of coffee more delicious and consistent.2、304 Food Grade Stainless Steel: The 51mm bottomless portafilter is made of food grade stainless steel, which is environmentally friendly, more hygienic and safe, and has the characteristics of oxidation resistance, corrosion resistance, rust prevention, and durability3、Detachable and Easy to Clean: The 51mm coffee bottomless portafilter has a detachable design, making it easy and fast to disassemble, easy to use, and clean without dead corners.4、Good Compatibility: This 51mm 2 ear portafilter is suitable for EC0310 and most coffee machines with 2 ear portafilter5、Filter Basket Included: Stainless steel 51mm filter basket is compatible for 51mm filter basket, providing you great using experience.