One-Piece fastening elements made of polyamide, characterized by extreme ease of use, because the anchoring is done by a single central screw. The cover is secured to the base. For the installation, simply press the conduit into the housing until it locks. The cover with snap-locking prevents any movement of the conduit. It's possible to arrange the conduit clamp collars in array employing a restrained joint realized on the details or by using a suitable mounting metal bar. Low fume emission in case of fi remakes these conduits particularly suitable for applications in the railway sector and all places where there is a greater risk of fire.