Collar assembly for fixing a tubular article onto an external support

Collar assembly for fixing at least one tubular article to an external support, of the type comprising a deformable insert for defining a substantially cylindrical cavity configured to receive the tubular article and a metal casing body delimiting a seat substantially inside which the insert is wrapped around the article, the insert comprising an external projection which extends radially towards the exterior of the insert and is configured to cooperate with a corresponding orifice formed in the seat of the metal body so as to position the insert inside the body, the projection comprising a base attached to the insert and a head connected to the base by a radially extending connecting part and provided at the periphery of the head with a protruding clipping edge configured to hold the insert inside the metal casing body, wherein the insert comprises, at the base of the projection, a through hole extending in line with the clipping edge.