a unique connector and insertion tool are disclosed . the connector is hollow with screw - type threads on its outer surface , an enlarged head at one end and a non - sharp configuration at the other end . the insertion tool has a non - sharp elongated shaft or piercer attached to a handle ; the end of the piercer is adapted to allow piercing and passage through the materials being secured together . the connector slides over the piercing shaft , is held in secure non - rotating relation thereto , and is configured to penetrate the materials and be screwed into place by the insertion tool . the entire piercing and connection operation may be conducted in a twisting motion with just one hand .