1. Bottomless design: The knock box can be matched with the under-table trash can so that the coffee grounds can be smoothly poured into the under-table trash can for faster waste disposal. 2. Sturdy material: This knock residue box is made of PTFE steel and rubber, and the edge gasket is made of rubber, which can reduce friction with the table surface and reduce noise at the same time. 3. Detachable rubber rod: The knock rod is made of PTFE steel and equipped with rubber, which has good cushioning properties and will not mark or scratch the filter element. 4. Easy to clean: The knock box can be rinsed directly with water and then dried with a rag, no other maintenance methods are required. 5. Main uses: The knock box can be used in coffee shops, home kitchens, offices, etc. It is not only a special tool for removing coffee grounds, but also a good helper for removing food residue.