These clips are used to mount pieces of 1/2" PVC to your vinyl corner posts that have bullet style pixels mounted in them. The clips have a relief on the back side that allow for up to 18awg wire to pass through allowing you to get the most out of your spacing. The clips are CNC cut out of 3/8" Marine Grade HDPE which is both UV stable as well as temperature resistant. Typically, most installed corner posts are roughly 8 to 10 feet in length. In testing, 3 clips per 8 foot section is more than adequate. To install, attach the clips to the vinyl corner post and snap the PVC into place.