Bars

Orc steel bars work exactly like iron bars do, but have a more fence-like look with a dark green hue.

They naturally spawn in the windows of evil fortresses (such as Dol Guldur towers, Angmar towers, and Mordor towers), replacing glass panes that would make the structure easier to invade or escape from.

Crafting
Orc steel bars can be crafted on the Morgul crafting table, Angmar crafting table, and Dol Guldur crafting table (the very factions of which these bars are used in structures). They are made in batches of 16 using nine Orc steel ingots arranged in two rows of three (the two rows have to be next to each other).