The easy way to empty used coffee pucks from your espresso machine. Simply strike the portafilter against the Knock Box's bar to empty up to 20 used pucks into the large-capacity bowl for no-mess disposal. No more trips to the garbage can or compost bin, this handsome stainless steel container can be stored on the countertop right next to the coffee maker. The rubber base prevents the Knock Box from sliding, and the knock bar removes for easy cleanup.