They work as advertised but really aren't hard to find as most hardware and hardware stores (including Lowes and Home Depot) sell them for less than half the price. sometimes referred to as "hollow door anchors". A note. Another reviewer mentioned that the welds holding the threaded end cap break easily. My only guess is that it could be caused by a fastener jammed with the screw in place. Best option: remove the screw completely, drive into the cargo area to attach the handles, then reinstall the screws. I've installed a few of these and had no problems with cracked welds on this installation.