✅ PERFECT SIZE - The 4.7inch size is perfect for storing underneath most common espresso machine brands like Breville, DeLonghi, and more. The capacity is large enough that you don't have to empty the grinds it too often. ✅ ANTIBACTERIAL - Manufactured out of a special antibacterial plastic to prevent bacterial growth. ✅ DETACHABLE KNOCK BAR - The steel bar is made from high-quality steel and wrapped with a special foam that will absorb most of the shock. ✅ SLIP RESISTANT - Rubber grip on the bottom of the coffee knock box will keep it from shifting during use. ✅ SATISFACTION GUARANTEED - We’re not happy until you are! For any defects in the materials or craftsmanship, please contact us and we will be glad to assist you.