... and concertina cross type. Material:galvanized sheet and wire,stainless steel sheet and wire.de as straight type and concertina cross type ... for the omportance safeguard such as the frontier defense line wire, sentry,prison, milirary bass and airport etc.Specification: BTO-10 ... ,BTO-22, BT-28, BTO-30, CBT-60, CBT-65. Coil Diameter range from 450mm to 1000mm. barbed iron wire