TC-RN Heavy series are used to mount TC-CHS single or TC-CHT twin tube clamp supports onto a mounting rail (TC-MR-4). The mounting rail is available in stainless steel (TCS-MR-4) and is used to mount tube clamps neatly in parallel. The rail nut can also be ordered on the complete clamp (TC-CHSxxxx-R) instead of the standard bottom weld plate.