HIGH QUALITY - Newly upgraded metal rubber knocker will not dent or scratch your portafilter, and will help to avoid overflow. There is a three-dimensional coffee bean pattern design on the knock lever, which increases the sense of fashion and makes your coffee knock box no longer monotonous. PERFECT SIZE - The 4.8-inch compact size is ideal for storing under most espresso machines, and is more suitable for home and office making coffee. The coffee bin of the espresso machine is large enough that you dont have to empty it often. ERGONOMICS - Our coffee grounds box is designed with an inclined angle, so that when you knock and pour coffee grounds, you can easily complete the clean work without bending your wrist significantly, avoiding injury to your wrist. EASY TO CLEAN - The knock bar on the large knock box can be removed for easy cleaning and hygiene, suitable for high-temperature washing in the dishwasher. STRONG STABILITY- The wide rubber base provides excellent stability to prevent slipping and tipping without scratching the table.