I'm pretty sure these are one of the most useful tools I've ever used. And I've never used it for the job I bought it for, which was removing a fork air cap, and now my air cap removes with a cassette tool.
The don't lock per se, but they won't slip if your putting pressure on the rear handle, and they'll slip if you reverse the direction, so you can kinda ratchet with them.
I'm pretty sure these are one of the most useful tools I've ever used. And I've never used it for the job I bought it for, which was removing a fork air cap, and now my air cap removes with a cassette tool.