Skybuilders' Nails

Skybuilders' Nails are miscellany used in the Ishgardian Restoration.

Source
Skybuilders' Nails can be crafted by blacksmiths as a level 40 recipe with the following materials:
 * x4
 * x4
 * x2
 * x4
 * x2

Uses
Skybuilders' Nails are exchanged for in custom deliveries to Potkin in The Firmament.