Upgrade path

Brown Iron Door Double→ 1× Steel Door Double →Steel Door Double

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 6 hits per upgrade.

Crafting

Craft at Backpack · makes 1

Crafted as Iron Double Door: pick this one of its variants when you place it.

Harvest drops

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

Drops when destroyed

When it collapses

Falling, it leaves Scrap Metal Pile (75% of the time) where it lands.

Where to find (5 POIs)

Navezgane County Jail (tier 5), The Last Sunset Nursing Home (tier 5), Booze Hound Brewery (tier 2), Hybrid Energy Substation #2 (tier 2), Downtown Hotel.

Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.