Grindenstein is a compact knock box that knocks out coffee grounds. It has been specifically designed for storage on the drip tray of the espresso machine under the group head. Its unique height helps reduce clutter on the kitchen counter and fits easily into the top rack of the dishwasher. The patented shock-absorbing design and the solid steel core make the Grindenstein truly indestructible. A thick and durable rubber cover protects the group handle, absorbs the impact, and ensures quiet use. Each Grindenstein and Big Grindenstein comes with an information booklet featuring great ideas on how to use the collected coffee grounds as fantastic natural fertilizer for the garden.