My assumption would be that it'll chip or bend the cutting surface of the tool, though it depends what your mudguard is made of. Thin sheet steel or those little wire hook type stays I think you'll have no bother, anything sturdier and I'd recommend something else, though I'm assuming since you're asking this question you don't really have any other tools? Even drilling them out might work better.

If the blade has a little notch with a blunt edge right at the base, you can use it to cut wires, but if it's sharpened along the whole length of the blade it'll just wreck the whole thing.

Do you not own a hacksaw? A dremel?

This is what the stays look like
https://www.youtube.com/watch?v=fhzECAgQx3c&t=53


Will post pic of garden tool tomorrow.

I could hacksaw it but it's rather pathetic, it remains an option. As does drilling.

>>2645 An error occurred. Please try again later. (Playback ID: 7OgubRsX0_O1QcZ5)

But do _not_ use the loppers to cut steel. It won't cut the steel, and you'll have an annoyingly damaged set of loppers. You'll certainly chip a chunk out of the blade, and may snap the anvil bit, and you can't get replacements anywhere. Fiskars = Bastards.
Seconding hacksaw or dremel. You'd need a pretty chunky set of wire cutters.

>>2646
They've tried to embed with a time signature of 53s.


https://www.youtube.com/watch?v=fhzECAgQx3c

>>2647

OP are you just trying to trim them down, or remove them entirely? Either way, even the smallest hacksaw will get though those, they're basically thick wire.

>>2645
I've got SKS guards on my bike, unless it's completely blunt your hacksaw will do just fine. You only need to get about 1/2 to 2/3 of the way through before they snap cleanly enough (the ends will be hidden in the retainer nipple anyway).

>>2648
If they are SKS guards, then they need to be trimmed roughly to size, roughly within 1/4".