Prism designed for large pipes with a diameter. Above all, it creates a solid support surface for round pipes. The prism with screwed-in collar can be fastened in the bore holes and securely fixed. For free positioning of the prism independent of the hole grid you can easily unscrew the collar from the prism. If necessary, the working height of the prism can be varied by a prism extension. Polyamid Prisms are used for scratch-prone surfaces.