Upgrade path

Barbed Wire Fence, Damaged→ 10× Iron →Barbed Wire Fence, Bloody→ 10× Iron →Barbed Wire Fence

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 4 hits per upgrade.

Harvest drops

Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.