Mithril nails are a type of nail in RuneScape. They are made with a mithril bar on an anvil with a hammer in the player's inventory, requiring level 54 in smithing and receiving 15 mithril nails and 50 Smithing experience per bar.
They can also be obtained during the quest In Aid of the Myreque. Mithril nails are tradeable, durable, and quite cheap as well, making them an excellent choice for lower-level furniture that uses nails.