What does this warning symbol on my pannier bag mean? I bought a pannier bag which attaches to the rear rack with 3 quick-releases. Each quick-release has a sticker on it:



What does this symbol mean? My guess would be something like "don't hit this with a hammer", but it seems rather unlikely that anyone would, so I'm really not sure what I'm being warned about.
It means "No tools" or "Use your hands."