Cover holders. F5 series is compatible with C5 series covers, therefore the covers are just click-mounted. However, in order to guarantee a major stability of installation it is recommended to use special cover holders. Cover holders are available in two versions: for wire diameters of 4 and 5 mm. In order to make an optimal installation a cover holder should be applied on each side at the distance of 1 m along the whole tray. Wire diameter 4 mm. Pack of 20 pcs.