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Concertina wire is made of high-tensile steel, which allows it to maintain its shape and strength even in adverse weather conditions. It consists of sharp-edged barbs that are evenly spaced along the wire, which serves to deter unauthorized access. The wire can also be manufactured with different barb configurations and spacing, catering to specific security requirements. Its unique concertina shape means that it can expand and contract, making it easy to install and transport.

Quality control is an integral part of the production in U-type nail factories. Each stage of manufacturing undergoes rigorous checks to ensure that the nails meet industry standards concerning size, strength, and finish. Factories often employ metallurgists and quality assurance engineers who test the tensile strength and resilience of nails to prevent defects that could compromise their utility.