Flat wrap razor coils
Flat wrap coils are a type of razor wire coil that are not wrapped in three-dimensional coils like BTC or Barbed Tape Concertina.
They are available in various sizes, and because they are flat, they can be tied directly to a fence to add another layer of security.
Flat wrap razor wire is also used for under-fence security on some high-security sites, when they are buried in a trench under the fence.