These clips are used to mount pieces of 1/2" EMT that have bullet style pixels mounted in them to vinyl J-Channel that surrounds windows, doors and garage doors. 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. I have found that 4 clips are sufficient for up to a 10 foot span. Simply attach the clips to the J-Channel and snap the PVC into place