Mudguards without chainstay bridge, but...

[Dadam]

Plyers near a bike

Three words: Knipex pliers wrench
Best tool I've ever bought.

A 250mm example lives in my toolbox and a dinky little 125mm one lives in my on-ride tool set.

Parallel jaw pliers. Work like water pump pliers but are in effect an adjustable spanner with zero backlash.

 

[silva]

I also have a pliers wrench in the tools in my front bag.
Not for the bike tho, most of the tools are ment to disassemble stuff I can use, discovered in cities many street garbage. Also a small hacksaw.
A pliers wrench is a kinda backup if dedicated tools not avail or fail, there is always the wrench. It's even usable as a hammer. It's less easy to aim but it's better than nothing.