- Threaded 12-24, with numbered spaces- Channels constructed from 11-gauge steel to provide extra strength- Ships flat to save space- Self-aligning design for fast assembly- Includes 50 rack screwsRL Series 19” 2-post open frame racks incorporate a self-squaring, self-leveling design for easy assembly. Top rails accommodate standard cable ladders. Strong steel construction. Choose from 10-32 and 12-24 threaded models.