Abstract: Temporary and long term guard rail systems for use by residential and commercial builders on construction sites to prevent accidental falls that can result in serious bodily injuries. The systems meet the standards of fall protection as specified by OSHA including those on safety issues concerning protrusions that can cause lacerations and present clothing snag hazards. The system includes a plurality of vertical posts/stanchions having side rail mounting points that do not present laceration and clothing snag hazards. The posts/stanchions include rotatable collars with internally threaded holes that create mounting points for the side rails that are capable of rotating along the Y and Z axes of the posts/stanchions allowing the interconnection of horizontal guardrails. The side guardrails can include telescoping tubular adjustable lengths or have a fixed length.