An essential tool for any home or professional barista, the knock box allows you to quickly and cleanly remove used coffee grounds from your espresso machine's portafilter. Just knock out the grounds on the rubber bar, wipe out the filter, and you're ready for another shot in seconds! Holds used grounds for disposal or composting. Stainless steel box is dishwasher safe; rubber base and bar hand-wash only. Measures 4-1/2″ x 4-3/4″ x 6-1/4″ H.