Socket to me means you're looking at the open end.

12 minutes ago, Bill W said:

Hmmm, I can think of an electrical socket and a wrench and socket set, but it has nothing to do with the late 60s and early 70s expression 'sock it it to me'.   Then again, maybe it does, since the phrase had a sexual connotation as well (a hollow part into which something fits).  😈 

Julie Carne was the Laugh In Sock It To Me Girl. Looking at her life, it worked.