Securextra 3510 Security Fencing has many of the attributes of Securextra® 358 Security Fencing and its main strength is it's lighter. Using 3mm wire instead of 4mm allows even better visibility allowing a wider variety of applications.It's lighter and cheaper so it's ideal for commercial applications. Advantages: The aperture is 73.2mm horizontal x 9.7mm vertical and makes 3510 Security Fencing extremely difficult to penetrate using conventional hand tools, thus providing a high delay factor.