The same spirograph for your puck, sized for 54mm baskets. Three geared arms trace hypotrochoid paths through the grounds: clumps broken, density equalized, bed level. Built for Breville/Sage machines and anything else running a 54mm portafilter. Fits 54mm portafilters (Breville Barista series, Bambino, and similar) Choice of aluminum or plastic gears; same geometry, same result Black The dial-in tool your Breville has been waiting on.