Abstract: Provided herein is an article which is by its nature readily clamped to the end portion of a metallic ware employed as a cable support rack, and driven into the ground. An insulative wedge according to the invention renders a linear metallic ware to not be in contact with the ground, and has the further advantage of comprising an end portion which penetrates earth readily but which is simultaneously deflected by subterranean conduits into which it may inadvertently come into contact with, thereby not interfering with the integrity of subterranean utilities, including wires, pipes, conduits, and the like.