These snake pair (nag nagin joda) are made in pure Silver for worship in kaal sarp dosh. nag nagin ka joda is very useful for removing evil effects and protects you from such harmful evil eye. it is often called as kaal sarp dosh nivaran divine tool. this is used for kaal sarpa puja. this naag nagin joda is also placed in the foundation of the building in the vastu pooja at the time of starting construction, and it is believed that it supports long life of the building.according to puranic scriptures, brahmas son kashyapa had four wives. the first wife gave birth to devas; the second to garudas; the third to nagas (snakes); and the fourth to daityas.