Flexibility / Expandability : The standard WallNet, of 500 mm depth can be expanded by installation of our extension kits. These kits are available in depth of 70, 100 or 140 mm and are fitted with either fift off hinge or standard hinge. Cable Management : The 19" Mounting rails are built into the front frame. Additional 19" Rails can be installed in the rear of the WallNet, or for heavy loads, an extra frame can be added. Cable Access : Cable access slots are provided on the top and base of the unit. Plastic snap in panels can be replaced with steel bolt in plates for added security. Unique cable pass through slots arranged in optional 19" rails provide improved access for your cabling needs.