Bean Input: The open metal bowl where you pour whole coffee beans.Grinding Burr: The internal mechanism that crushes the beans into consistent sizes.Shaft: The central rod connecting the external handle to the internal burr.Handle: The crank you turn manually to rotate the shaft and spin the burr.Coffee Bean Grinder,Manual Coffee Grinders,with Grind Settings & Catch Drawer, Vintage Hand Held Coffeemaker Small Burr Coffee Grinder Machine for Kitchen, Camping