zeroHero 51mm Sword Espresso Impact Tamper - For DelonghiThe zeroHero Sword Tamper guarantees that you get consistent force and level tamping every time. Helping to produce the best and most consistent Espresso possible. This is one of the only Impact tampers on the market in the 51mm size for Delognhi Espresso Machines. How It Works Firstly, the collar of the tamper makes sure that the tamping plate is parallel to the the basket before you apply pressure. Then you press down on the tamper until a force of