Knock Box – Barista Style – Dispose of your used coffee pucks quickly and easily within inches of your espresso maker. – The size is perfect for storing underneath most espresso machines. The espresso machine knock box capacity is large enough that you don’t have to empty it too often – Rubberized knock bar won’t dent or scratch your portafilter and helps eliminate spills. – Rubber bowl can be removed from its plastic holder for emptying and cleaning. – Wide rubber-grip base provides excellent stability, prevents sliding and won’t scratch kitchen countertops.