Stainless Steel Counter Top Knock Box7. 32 Square Countertop Knock Box 7. 32" x 7. 32" x 5. 07" Knock the portafilter on the bar of this coffee knock bin for cleaning. 7. 32 square box with a depth of 5. 07 Widely used at cafes, restaurants and bars Made of stainless steel, durable for long term use Empty espresso shots into knock box to keep your counter area clean Deep bowl design, with large capacity