Slide adjustable wrench - GIF

[schuylergrace]

In case anyone is wondering how this thing works (I was), here you go. The slide has a peg that rides in a spiral groove in what appears to be a brass shaft that runs the length of the handle. The shaft turns a pinion gear that drives the rack that's part of the moveable jaw, like on a regular adjustable wrench. There's also a tube around the shaft, which has a spiral cut into it, too, and appears to be a dust cover. It's a kinda nifty little piece of work, if you ask me. (This is a still from a YouTube video. I was going to post the video, but it's a not terribly well done review of the wrench.)