Rugged stainless steel design with removable metal reinforced knock bar. 7" x 6-1/2" x 4" deep. For espresso-related applications: When you clean the portafilter handle of your espresso maker, instead of banging it on (and denting) your sink, you can knock that tool against the bar in this knock box—the rubber-covered bar will absorb the bang, and the pan (or "box") will catch the grinds and prevent a mess.