About This FAST PROCESSING - Dispose of your used coffee grounds quickly and easily within inches of your espresso maker. You can store old coffee grounds for gardening, old coffee grounds can be a rich fertilizer option for your garden beds. Black espresso knock box give you ample storage space for holding the residual coffee grounds so that you can later transfer them to a compost bin. PERFECT SIZE - The coffee waste bin only 4.8inch 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, made of sturdy ABS plastic with a food-safe rubber bar. HIGH QUALITY - Rubberized knock bar won’t dent or scratch your portafilter and helps eliminate spills, it keeps The Portafilter Safe. DETACHABLE KNOCK BAR - Rubber bar can be removed from its plastic holder for emptying and cleaning,The bar comes out easily for fast cleaning. STRONG STABILITY - The puck box features a non-slip rubber pad on the bottom to stabilize the knock box and reduce noise, prevents sliding and won’t scratch kitchen countertops.