About this item Bottomless coffee knock box constructed from durable stainless steel and rubber, resistant to rust and corrosion, ideal for commercial coffee shops, offices, and homes alike Open bottom design of the knock box allows for easy disposal of coffee pucks to a dump bin underneath Knock box features a non-slip rubber knock bar and a rubber padded rim that helps protect the portafilter and absorb the knock shock Knock box designed to be mounted on a kitchen countertop, providing a convenient and accessible location for disposing of coffee grounds Knock box has a large opening, allowing for multiple espresso pucks to be disposed of and prevent the grounds from spilling out