These are hotdip galvanised fastners approved by the Powergrid Corporation of india. There are 5 major powergrids constitue into one national powergrid. The powergrid business is in transmission of power across india, they have approved certain quality regarding the hotdip galvanised bolts nuts which are tested under strict conditions to give maximum protection against corrosion and improve longevity. These fastners vary from 8mm-30mm.
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