Medium Quality Folded Sheet Metal is a common ingredient that's used in many different suits of amor made through the Smithing profession. All three of the items required for this recipe are purchased from a vendor; although Block of Medium Quality Ore isn't sold by every Smithing Supplies vendor. Check the one in Plane of Knowledge or East Freeport for this item.
The Smithy Hammer is not consumed upon successful completion of this recipe so you'll only need to purchase a single one of those. All the other items are consumed as usual.
Medium Quality Folded Sheet Metal