Meaning the one who works with metal fragments, this blacksmith ring is imbued with those that work hard toward their goals and even find ways to make it easier along the way.
While Eitri used magic in a forge that was extremely hot, Brokkr worked the bellows so that the fire would not cool down nor get too hot for the magic. While making the boar Gullinbursti, a gadfly, often thought to be Loki himself, came and bit Brokkr on the hand. Brokkr was not disturbed though and kept blowing into the fire. While making the golden arm ring Draupnir the gadfly came again and bit Brokkr, this time in the neck but Brokkr kept on blowing. Finally, while making the hammer Mjölnir the gadfly bit Brokkr on the eye this time. This temporarily caused Brokkr to stop blowing. That brief stoppage of blowing into the fire caused Mjölnir's handle to become shorter than it should have been. Because of this, Thor had to wear the iron gauntlets Járngreipr to handle it.