"Surface or suspension channeling systems. Trunking is cold-rolled, phosphate white epoxy polyester powder coated steel sheet (thickness: 0.8mm). Mounting is made possible by: • NAL 1652 Terminal board socket for quick electrical connection of NPQ- series devices . • NAL 1032 support for the suspension of NPP, MARINER, MAC devices and others with mounting holes of minimum 5mm. We recommend to follow the supplied installation instructions."