Special breakout box which enables you to access all pins on a 14 pin Mercedes Benz Sprinter, Volkswagen LT connector via 4mm female banana sockets.

 

Some cars use a lot of different K-lines for it's different systems like engine ECU, ABS, SRS, etc. hence this is needed for most scan tools if you want to access all the systems just by plugging the K-line into the right communication socket of the system (examples of such cars are Volkswagen LT and Mercedes Benz Sprinter)