Must be some alternative use for these.

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It's a capo, designed specifically for holding guitar strings down at the tension/strength required (which is not a lot, to be honest).

Anything it can do, in a woodworking sense, can be done with a simple spring clamp.
 
Umm, I know what it is, I bought it to use on a guitar. That's why the word "alternative" is in the subject title!

While I agree partly about the simple spring clamp, the low profile and the fact that you could conceivably tap holes and screw something to the top bar could make it useful in applications where a simple spring clamp would not be.
 
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