In the world of Svaralfhein, the dwarven brothers Brokk and Sindri were asked to create gifts for the gods. As always Loki was involved, as the main purpose of creating these gifts was to repay Sif after cutting off her hair.
One of the most well known gifts they created was the hammer that was given to Thor. This hammer was the strongest weapon against giants and was traditionally used as a symbol to bring blessing to marriages. To keep evil away from the couple and bring fertility to the bride.