Knipex Pliers Wrench
One staple in my toolkit and tool roll are the versatile Knipex Pliers wrench. With their smooth parallel jaws they can replace every size of spanners - metric and imperial. The smaller wrench from my tool roll is merely 125mm long and can grip up to 25mm or 1" and the bigger one living in my toolbox can manage up to 35mm or 1 3/8". On modern bikes there are mostly bolts with inside hex, but there are still solid use cases for the wrenches:

During the Rookie training of the MTB Club Konstanz I removed a basket off a bike which was fastened with nuts and bolts

Trueing disc brake rotors

Field repair of a dropper post

Opening air chamber of a suspension fork

Countering an end cap on a wheel hub when adjusting the play of the conical bearing

Tightening a valve core

Crimping end cap on shifting cable

Pulling shifting cable tight before fasting it to the derailleur

Pulling foreign objects from tyres

Countering bladed spokes or tightening Spike nipples

opening chain link

Removing/installing E-clip and safety pins on brake pads
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