Fences
Log Wall Left Spikes 01
A wood block with 200 hit points.
Harvest drops
Wood× 8
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Wood Debris (Terrain) (75% of the time) where it lands.
Where to find (2 POIs)
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.