About This High Quality: The coffee knock box is made of high-quality rubber material, durable, lightweigh and long-lasting use. Also rubber materials are not only wear-resistant and anti-slip, but also can reduce noise when you use Easy to Clean: Our knock box is featured with a removable stainless steel knock bar. You can separate easily from the base for thorough cleaning, and keep your coffee station neat with minimal effort Compact and Practical: Petite 4.3 in diameter and height fits neatly beside any espresso machine; perfect for limited countertop space; dual side handles for easy handling; hang-tab design allows convenient wall storage Built to Last: Made from thickened ABS plastic; highly impact-resistant and built for everyday use; reinforced with rubber-wrapped knock bar for reduced noise and longer service life; sturdy rubber pad at base for extra stability Perfect Compatibility: Fits portafilters sized 51 mm to 58 mm; suitable for most semi-automatic espresso machines; ensures seamless workflow when paired with your coffee tools; ideal for home baristas seeking efficiency