This is a very handsome box for which you may knock spent espresso grounds from your portafilter. This unit is constructed of stainless steel. The knock bar is covered with rubber to reduce damage to the filter basket. The thick rubber base keeps the box from sliding on your counter top and also reduces noise. Overall dimensions are 4 1/2 x 4 3/4" x 6 1/4" Dishwasher safe. The ideal home knock box. Get yours today."