This is a set of 4 pool noodles. To use these to secure hangers on racks, put a single cut in the noodle the entire length of the noodle. Open the noodle up and slide over the open side of the hangers on the rack. The rack bar should be in the middle of the noodle now. If the noodle is too long, you can cut it to length. Consider marking it with the location so if you have several different lengths you need, you can always put the noodle in the same location. Also, with the noodle installed, put a couple small bungee straps around it to keep it in place.