Have you ever tried to build a straight wall using only a rope as a guide? I had and it wasn't easy. I tied my thread in a knot and then held a level against it and tried to test without even touching it (because that would ruin it). I built my retaining wall around this string and had to constantly walk back and forth to get it straight. I was able to do it but it took a lot longer than if I had used some of them. As you'd expect, these levels are properly calibrated (otherwise it would be an automatic one-star) and will easily hang from any regular-sized string. The hooks are actually rear-facing so, while easy to put on, you can move the rope back and forth without worrying too much about it falling off. I also like that each one has a little clip on the side so you can just hang it in your pocket instead of falling to the bottom of a cliff. The clips (like the rest of the parts) are regular plastic, so you have to be careful, but not so careful that you don't break them just looking at them. And if you break one, you know what, you have a spare! This is actually my favorite piece in this set. You get six levels! I know it doesn't sound like much, but I often lose things when I'm working on a project. I've got three or four hammers, a couple of box cutters and I'm not even good with tape measures. They always seem to just disappear, but with them you have enough to run a few lines and still have extras! Sorry I didn't want to talk about it but I'm very excited and highly recommend this product.
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