This tool allows you to de-pin the very common Bosch style connectors found on all bmws in the 80s and 90s 

 

NOTE:

BMW permanently locked many of these types of connectors. This means they are NOT able to be de-pinned and will need to be replaced completely. 
to learn more visit my blog post. 

We sell 2 and 3 pin connectors on our site. These connectors are not locked and will work with this de-pin tool. 
2-pin Bosch style connectors 

3-pin Bosch style connectors