General description The 51mm bottomless portafilter is an essential accessory for domestic coffee machines, designed to enhance your coffee brewing experience. It allows you to observe the extraction process, helping you achieve a more uniform and delicious coffee. The bottomless design showcases the beauty of the espresso as it flows, creating a bright golden brown coffee column. Technical specifications Size: 51mm Material: ABS + Metal Color: Black + Silver Package Contents: 2 x Coffee Handle, 6 x Filter Cup (1, 2, and 4 Cups each) Measurement allowed error: +/- 1-3 cm Compatibility and accessories Perfectly compatible with 51mm bottomless portafilters. Usage Helps observe the drip column, flow rate, color, and stripes for better extraction judgment. Produces a richer and higher quality coffee liquid. Easy to disassemble and convenient to use.