A concertina configured galvanized steel wire used for outer boundary fencing on ship’s deck to defend ships from the vandals, like pirates. The razor wire prevent any intruders from penetrating by piercing or gripping them. Two patterns of loop are available ; Single Loop or Crossed Loop, and also standard diameter are available from 400 mm to 900 mm. Standard coil length when extended is 15 mtr, and they can be lengthen by connecting clips.