Works with standard 3.3 pound Mahlkonig EK 43 hopper and factory lid to increase hopper capacity to a little over 5 pounds. This tool saves 5 to 7 minutes of labor cost as the person grinding the coffee does not have to manage the grind process. They can be starting to fill another order or serve another guest as the grinder holds the full 5 pounds at once allowing the operator to fill it and work on another task while it grinds. Save labor cost. Eliminate the need for an extra grind bag. Serve more guests. Also check out our 5 pound hands free bagging system. Such a good bagging tool that a Starbucks manager bought one for their roastery store. Also, our grinder hoppers have been purchased by Costco as well. Order yours today and see how much easier and faster grinding and bagging can be.