These clips are used to hang pieces of 3/4" PVC from your gutters 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. I have found that 4 clips are sufficient for up to a 10 foot span. Simply attach the clips to the PVC and hook on to the gutters. The combined weight of the PVC and lights is enough to keep them stable even in the harsh Wisconsin Winters.