Brokkr & Eitri (Sindri)

Hello everyone. The thought has come to me multiple times now on the brothers Brokkr and Sindri, (The Dwarves of Norse legend and creators of the hammer Mjolnir) and who they actually are. According to Norse Mythology they are legendary blacksmiths of unparalleled craftsmanship. But who are/were they really?

Are they simply egregores or ancient entities?
I have never heard of anyone attempting to contact them in evocation but I would like to hear from you all and whether or not contact can or has been made.
I come from a family of iron workers, welders and fabricators. I myself sell steel. Metal work has been very influential in my life and is most likely why the idea of master metal working entities peak my interests.