Johnson's 1/4" stainless steel vertical rods are an excellent choice for vertical railings. The 1/4" rods need to be placed every three inches to satisfy code requirements. Held in place at the top with Johnson's Button End Cap, the rod is tensioned at the bottom with 1/4" x 28 thread. A wrench flat is provided at the bottom to rotate the rod tight. The rods can be threaded directly into the railing or held with a conventional nut and washer. A steel fabricator must provide a framework and cap rail for the rods. Additional sizes available; please call for more information.