Compatibility Perfected: This 51mm coffee distributor is meticulously designed Self-adaptive adaptation to the height of the flour without adjustment The base of the powder distributor descends slowly along the bottom of the middle cover without adjusting the height Optimal Coffee Ground Distribution: Engineered with three angled slopes, this tool ensures a circular motion for coffee grounds, achieving a consistently even puck. Ideal for those using a bottomless portafilter, it eliminates inconsistencies.