All Barista Basics Knockboxes are designed with quality, durability, and strength. These knockboxes are made with strong ABS plastic and include a removable NBR rubber knock bar. Each knockbox also includes an NBR rubber hush gasket for noise reduction. These units are easy to clean with their removable parts. Features: Includes NBR rubber hush gasket Removable rubber knock bar Holds up to 25+ discarded coffee pucks Can be used in counter or countertop applications BPA-free 5mm thick body Handwash only Made of 100% recyclable materials. Specifications: Top Diameter: 172mm Top Rim Diameter: 6mm Depth: 158.8mm Please note: We recommend having the product in-hand before cutting into your benchtop. The knockbox should fit snug within the hole to ensure proper function.