1、Bottomless Design: The knock box can be matched to the trash can under the table so that the coffee grounds can be smoothly poured into the trash can under the table for faster waste disposal. 2、Strong 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 percussion rod is made of PTFE steel and outfitted with rubber, which has good cushioning properties and will not indent or scratch your filter element. 4、Easy to Clean: The knock box can be rinsed off 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 houses, home kitchens, offices, etc. It is not only a special tool for disposing of coffee grounds, but also a good helper for disposing of food waste.