These nuts run along the worm-drive that's part of the lifting mechanism in the Maggiolina range. In the unlikely instance they wear out, here they are. Sometimes on the older tents the aluminium nuts crack (after many years). These nuts are the newer acrylic nuts, so they're tougher than the old aluminium ones. They suit tents made since 2007. They come in left and right, and each tent has two of each.