Concrete Bollard
A composite material composed of sand, stone, and cement. This block can not be upgraded and is likely only found in the creative menu.
Harvest drops
Small Stone× 25
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Destroyed Stone (75% of the time) where it lands.
Where to find (30 POIs)
7 Days Suites (tier 5), Haven Hotel (tier 5), Higashi Pharmaceutical (tier 5), Pop-N-Pills Factory (tier 5), U.S. Army Post #7 (tier 5), Don Vittorio Spagetto Residence (tier 4), Holvez Rent-a-Car (tier 4), Hotel Zombona (tier 4), HSP Logistics (tier 4), Pineballs Bowling (tier 4), COC Chemicals (tier 3), Crack-A-Cafe (tier 3), KZL Radio Station (tier 3), NDC Checkpoint Two (tier 3), Pop-N-Pills (tier 3), Savage Country (tier 3), Shamway Warehouse (tier 3), Super Savage Country (tier 3), The Road Gentleman Truck Stop (tier 3), Vick Garrison's Pedipawn (tier 3), Working Stiff Tools Warehouse (tier 3), Canyon Gift Shop & Diner (tier 2), Crack-A-Book (tier 2), Pass-N-Gas Store #09 (tier 1), Civic Square, Midway Hospital, Navezgane Outlets, Pop-N-Pills Urgent Care, Pristine Healthcare, Wasted Office Suites.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.