I bought one of these and another brand to compare how easy they are to use. This is a winder. You can't see it in the picture but there are two screws holding things together. It is also important to follow the instructions. They might seem daunting at first, but once you get the hang of them, you'll see how useful they are. I just bought a few more. I'm confused as to why I can't find the female version on Revain. I would like some of these too.
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