Ladder Rung Clamps are mounting brackets which attach the carrier rail to the ladder or tower cross members at the top and bottom of the full installation, as well as every 6' in between (aluminum rail is attached at 4' intervals). The clamps are available in Galvanized, Stainless Steel or Aluminum to match the rail material. Rung Clamps come complete with attaching hardware. Attaching brackets for special applications such as poles are also available