I needed a key to 36 (coarse!) To dismantle a steering rod and my wrench was too ... just my plumber neighbor lent me this knipex clip ... of dubious after dismantled the link effortlessly without the mark, I moved to admiration! it's really an incredible tool ... it is accurate (by adjusting rack and lock), it is handy (much thinner than a wrench), and it does not mark the nuts that clamp the greenhouse ( with leverage) at the same time that the running: essential when you tighten the nuts eg chrome (plumbing). Used to tighten nuts to 46mm maximum (huge), but also works very well on small nuts, although in practice the key size is not suitable for small spaces. So, impossible not to buy it! It is relatively expensive, but the price is forgotten, the quality remains!