As mentioned in other reviews, the quality control of this product is an issue. Of the four packs ordered, two turned out to be unusable as the various fasteners included in the kit had failed quality control (z should have fit through the metal loops, was actually too big to fit through). The kit does not contain any additional parts to compensate for these quality control errors, so if any of the parts have manufacturing defects, the entire kit will be rendered unusable. The other two kits work well and are easy to install, but out of the four kits, fifty percent were defective - it's a pretty terrible ratio and I'm genuinely concerned that while two kits appear to be working properly, they are from one manufacturer , which obviously has serious quality control issues, and you never know how that will affect the long-term performance of the device.