Grindenstein Coffee Knock Box CharcoalThe Grindenstein is designed for shock absorption and has a solid steel core that makes it virtually impossible to break. The extra durable rubber sleeve absorbs shock, protecting your group handle and making it more comfortable to use. It is intended to be stored on the drip tray of an espresso machine (under the group head). It's ideal for reducing kitchen clutter. Easily fits most dishwasher top racks as well. Dimensions are: Diameter 11cm, total