TC-RN Light series are used to mount TC-CSS single or TC-CST twin tube clamp supports onto a mounting rail (TC-MR-1,2 or 3). The mounting rail is available in stainless steel (TCS-MR) and is used to mount tube clamps neatly in parallel. The rail nut can also be ordered on the complete clamp (TC-CSSxxxx-R) instead of the standard bottom weld plate.