【Observe the Extraction Process】The 54mm bottomless portafilter allows us to observe issues that occur during the extraction process, this allows us to make adjustments to roasting, grind size,powder volume, sieving, dispensing, etc.during the next Extraction 【Easy to Disassemble and Clean】The 54mm bottomless portafilter can be easily removed and cleaned without leaving any dead space. 【304 stainless steel and solid wood handles】54mm bottomless portafilter made of food grade stainless steel for direct contact with ground coffee, sturdy and durable. 【Compatibility】This 54mm bottomless portafilter fits 54mm filter basket models of most triple ear coffee machine brands. 【with 51mm roundness screen】The filter prevents coffee from building up on the shower screen and keeps the spray head clean, so you don't have to clean or rinse as often, thus extending the durationlife of your espresso machine.