This 54mm Portafilter Holder is specifically designed for the Turin DF54 grinder, replacing the original holder to perfectly accommodate 54mm portafilters. It works best when used with a small dosing ring to ensure precise dosing. Grinding directly into the portafilter without the dosing ring may cause excess mess, so using the ring is recommended for a cleaner, more controlled grind experience. Ideal for professionals seeking accuracy and efficiency in their espresso preparation.