About This QUALITY OF MATERIAL:The knock box is made of durable 304 stainless steel, the holder was made of solid steel , super strong and sturdy, knock it and do not worry about breaking it HOW TO PROTECT YOUR PORTAFILTER: The knock bar was made of ITL project rubber which plays a role in buffering to protect the handle of the coffee machine, Easy to knock out clean coffee pucks with the knock bar CONVENIENCE TO KNOCKING OFF: When the portafilter is knocked off, the coffee grounds now fall directly into the grind box. The raised rear wall prevents splashes. No cleaning the countertop afterwards PERFECT SIZE: The coffee grounds bucket is 7.28 inch in lenght , 6.8 inch in width, and 4.25 inch in height,It's the perfect size and doesn't take up to much counter space EASY TO CLEAN: Detachable design, thanks to the wide opening, the knock container is now freely accessible. The inside can be rinsed with water comfortably. Also suitable for the dishwasher