Electrical
Old Lantern, Wall with Spike
Put the crafted block on your hotbar, hold Reload and select the Shape entry from the radial menu. Click or Shift-Click to select a variant to build with.
Crafting
Craft at Workbench · makes 1
Crafted as 
Old Lantern: pick this one of its variants when you place it.
Forged Iron× 5
Nails× 5
Cloth Fragment× 5
Oil× 5
Drops when destroyed
Iron× 5
When it collapses
Falling, it leaves 
Scrap Metal Pile (75% of the time) where it lands.
Where to find (1 POIs)
Casa de Machina (tier 1).
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.