Security  concertina razor wire

Concertina razor wire is a type of barbed wire that is designed to be difficult to climb or cut through. It consists of sharp, pointed blades that are tightly wound together in a spiral formation, creating a high-tensile barrier. The name "concertina" refers to the accordion-like shape that the wire takes when it is stretched out. 

Concertina razor wire is commonly used in military and security applications to secure perimeters and deter intruders. It is also used in prisons, detention centers, and high-security facilities.