This is a metal collar to use with a portafilter on the Turin DF64 grinder. It is designed to make the operation of the DF64 less messy. This will NOT fit the plastic dosing cup OR the metal dosing cup, if you want a dosing cup collar, you will need to order the dosing cup collar. This ONLY fits 58mm portafilters.
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It fits well and good machining. Very nice.