This is a stainless steel version of the OEM clutch fork pivot pin used in manual transmission BMW's 1992 and newer.

Originally available for the 850CSi V12 6-speed cars, this pin can be used in virtually all BMW manual transmissions. 

The stainless steel pivot pin replaces the plastic pin which can wear over time.  They also can break during clutch installation or with a heavy duty clutch.

It's a cheap upgrade when going to a high pressure clutch.  Being half the cost of the OEM piece, it is also very affordable.

Remove your old, worn out plastic pin by prying it out with a screwdriver or pulling it out with pliers.  Then, simply place this stainless pivot pin the transmission and give it a gentle tap to set it in place.