【About the Product】 This knock box is a container for discarding used coffee grounds after espresso extraction. You knock the portafilter containing the extracted coffee grounds against the top of the knock bar. 【Features】 * Large opening angle for coffee grounds to fall inside. * Non-slip rubber on the bottom. * Sturdy and sound-dampening knock bar, removable with screw fixation for easy cleaning. 【Details】 * Made of polished stainless steel. * Height: Approximately 10.4 cm From the bottom to the lower part of the opening: Approximately 6.5 cm From the lower part to the upper part of the opening: Approximately 3.9 cm * Diameter: Approximately 11.4 cm * Diameter with non-slip rubber: Approximately 11.8 cm Non-slip rubber height: Approximately 1.5 cm Non-slip rubber thickness: Approximately 3 mm * Weight: Approximately 370 g * Maximum capacity: Approximately 580 ml (can hold the residue of about 7 cups of coffee grounds)