Coffee Knock Box-Black - Brewing EdgePlastic knock box,black with a towel and a bag of garbage(25pcs) The knock box is one essential accessory for home baristas to help dispose of your espresso pucks. Commercial Large Capacity Floor Standing Coffee Grounds Bin made of engineering plastic material, durable and sturdy, prevents bacterial growth from inside. Anti slip design at the bottom, more stable when knocking slag. The knock box was designed to fit underneath most common espresso