The largest, thickest, and most rigid rail system on the market today. Three-Rib Steel Guard Rail System includes 11-ga., 2-1/2"Dx14"H corrugated steel planks that are mounted to 1/4" thick structural steel posts. Closed return flanges. Secured with 3 bolts per rail end in pre-tapped connection holes. 10" sq., 5/8" thick steel baseplate may be bolted to the floor for added stability. Single post is 17"H, double post is 43"H. Yellow powder coat finish. All hardware, anchor bolts, and steel column caps are included.NOTE: Rails and posts are sold separately. Must order both rails and posts to build a complete safety guardrail.