A fixed fastener is suitable for installing substructures on roofs covered with trapezoidal sheet metal roof coverings such as Trimo, Armat and similar. The fastener is appropriate for extreme environmental effects. Fastener is screwed onto the trapeze wave with four side screws. The seal ensures water tightness at the point of fastening. Fastener has a transversally mounted fastening plate for fastening mounting profile. In a set together with fastening bolt. The dimensions of the trapezoidal saddle are customized to suit your roofing. The drawing of the trapezoid shape of the roof is required with the order!