An essential part of the coffee kit for any hands-on coffee lover. Tap your filter holder onto the Knock Box to empty coffee grinds out. Stunning Knock Box for the disposal of used coffee grounds Simply tap your filter holder (group handle) onto the Knock Box to release your coffee grounds out of the filter holder Knock-box diameter: 128mm Solid and stable. Mirror polished stainless steel finishing Rubber bar with an iron core for best operation Non-slip rubber base to absorb shock Rubber trim on the upper edge for a greater safety Dishwasher safe