
It is a demo piece for thin wall sockets to show how well they work in limited access applications.
Yes you are missing the foam block with the 4 sockets 1 craftsman 10mm deep 3/8 drive, one Matco, one Mac and one snap on. The demo shows that the snap on is the only one that is thin diameter wise enough to fit in the end of the handle to get to the nut. Also the other end shows the advantage of the shallow broaching on the snap on you can put the nut in your deep 10 mm snap on socket and still start the nut on the threaded rod