Breville Knock Box™ 20 Keep your espresso routine clean and effortless with the Breville Knock Box™ 20. Built from durable, die-cast metal with a removable inner bowl for easy cleaning, this compact knock box lets you quickly dispose of used coffee grounds like a pro. The anti-slip rubber grip ensures stability during use, while the soft, barista-grade knock bar minimizes noise and protects your portafilter. Perfect for any home espresso setup.