What are on top of jail fences?

Question

their circular with spikes comin out of them

Answer 1

It is called cut wire.  Very sharp knive like barbs cover regular barb wire.  It will cut you pretty bad if you  try to climb over it.

Answer 2

some also call it razor wire. Simular to barbed wire except where the barbs would be has been replace with very sharp razors. Designed to cut and slow any escape without killing the inmate.

Answer 3

razor wire or Concertina wire sometimes both. Vary nasty stuff.

Answer 4

Well in regular terms its called a cut wire. Very sharp knive like barbs cover regular barb wire. It can cut you intensely i advise don't try climbing over it. Some people may call it barb wire they are both the correct terms for this situation. They are designed to slow down a person who is trying to escape.

Answer 5

Barbed wire.  Dont touch!

Answer 6

Razor wire