About 15 pieces recovered on the Baltic coast from a Viking ship site. Nails, 2 partial knives and wood fragments, exposed to the iron fasteners so long that they are magnetic. Also, a rove and rivet the fasteners which allowed production of the long ships. Construction involved overlapping the hull planks and fastening them with the rivet and rove, an iron gusset on which the end of the rivet was peened making a locking device which locked the planks together. Thousands were used on a single ship, their light weight allowing for the light sleek hull construction. In fact, the hulls were built before, and independent of the inner framing which came later to support decks and masts. We have had only one complete rivet and rove. This example retains only a portion of the rivet and the complete rove. Viking ship group.