A support for parallel runs of coaxial cable is made up of pairs of molded blocks stacked on a single threaded rod. The blocks of each pair are identical, and have semi-circular cylindrical recesses which cooperate to provide circular, cable-gripping passages. The threaded rod extends in orthogonal relationship to the axes of the cable-gripping passages, through another passage located between two of the circular, cable-gripping passages, and cables can be installed and removed by loosening a nut on the rod, separating the blocks of a cooperating pair, and sliding the cables into and out of the recesses, without detaching any of the blocks from the rod. The blocks have interengaging ribs which prevent any pair of blocks from rotating about the rod relative to another pair of blocks.