This modern knock box stainless steel is made of heavy-duty stainless steel and features a padded rubber base to accommodate daily use. A curve allows for proper placement of the portafilter to prevent coffee grounds from splashing. The knock bar is protected by rubber tubing to shield your portafilter from direct impact. The knock box is dishwasher safe for easy cleaning and maintenance. It measures 6.25"H x 4.5"W x 4.75"D.