BUOY

SN Blocks of solid concrete, in the shape of a round bottomed cone usually 2 feet 6 inches across x 2 feet 9 inches high. Buoys were mainly used in road blocks intended to impede enemy movement in the event of invasion.
CL MILITARY DEFENCE AND FORTIFICATION
BT ANTI TANK BLOCK

 
 

BUOY

SN Blocks of solid concrete, in the shape of a round bottomed cone usually 2 feet 6 inches across x 2 feet 9 inches high. Buoys were mainly used in road blocks intended to impede enemy movement in the event of invasion.
CL MILITARY DEFENCE AND FORTIFICATION
BT ANTI TANK BLOCK