This is the replacement 4mm pin to be used in the FWF - Uhlmann & Allstar body cords. All the German made clam sheel ends fit this pin. The 4mm pin goes by many names: "Fat Pin" - "Big Pin" - "Not the Small Pin" and so on.
If you have that one pin that likes to wobble, or the "Bird Cage" is just not there. Its time to replace it: plus, it cheaper than an new body cord/wire.
Sold in units of (1)