Consistency in dosing - Precisely made to fit your portafilter
Stop Wasting Your Coffee! Portafilter Dosage. Adapter pilot diameter is held within +/-.002" which is half of 10th (.05mm) of a millimeter For example: 58mm pilot diameter no larger than 58.1mm and no smaller than 57.9mm. Please beware 54mm pilot diameter is to big for Breville 54mm basket.