The Chain / Chain Case assembly is constructed from several parts from which the Case *nh1* is the most expensive.
Some items from this specific schematic: Bolt,hex.,6x40, Bolt,hex 6x40, Bolt,hex., 6x40, Bolt,hex., 6x16.
The Bolt,hex., 6x16 is the lowest priced item on this Chain / Chain Case schematic.