We provide two lengths of stainless steel screws with each of our shields. The first is for the 2 and 3 inch vents, the second longer one is for the 1 1/2 inch vents. All are small 1/8 inch screws with Phillips head screws painted black so they dont stand out. We have looked at using a nut driver type of screw, but they have large heads that tend to be very visible, so we have stayed with the standard screw for now. If anyone has a better idea please let us know.