Eureka Diamond Burrs 75mm Diamond Inside Burrs Burrs with a superior crystal structure thanks to our patented process. Diamond Inside is a patented process for thermal cryogenic treatment of burrs at temperature -193° C (patent pending) resulting in the formation of an increased crystal structure that guarantees a superior wear resistance and duration. Diamond Inside is able to preserve the optimal burrs sharpness longer than any other burrs typology, keeping the granulometry constant for an exceptionally high quantity of ground coffee.