Abstract: A two-piece winding key for folding collapsible-wall tubes and similar containers having an elongated blade with a lengthwise slot, a U-shaped clip and a pivot made up of elements integrally molded with the blade and the clip. The pivot comprises a rod terminating in a head, a first cylinder terminating in a retainer, each of which is opposed to each other on opposite arms of the clip, and a second cylinder on an end of the blade. The second cylinder fits over the first cylinder, and the rod snaps into the interior of the first cylinder to form a smoothly operating and durable pivot. The first cylinder may also have an annular boss on its outside surface for a more snug fit with the second cylinder. The slot in the blade may be provided with teeth for engaging an end of a collapsible tube without slippage. The tube is folded up by rotating the blade about its lengthwise axis, using the clip as a handle. The clip pivots so that it surrounds the blade in a closed position to prevent the tube from unfolding.