SnappRAIL Clip Holders can be attached to the surface individually with a screw or nail (not included); or attach several in a row to clip holder rail (800-500) with adapter (800-501). Clip holders can quickly and easily secure either flexible tubing (PEX or PERT) or rigid copper tubing by pushing the tube into the mounted clip holder rail. Removal of the tubing, if necessary, is easy without damage to either the tubing or the clip holder.