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EDC pocket multi-tools often have a wrench (spanner) area that is rather lacking in usefulness. This vid shows how to make a killer, universal adjustable wrench for your keys or mini survival tool kit by sawing down an inexpensive product: "TEKTON 23001 4-Inch Adjustable Wrench".
Since it is made from tough "drop forged and heat-treated carbon steel" you'll need a good hacksaw (and a drill if you want to make a key chain hole) made for HARD metal. Mine is being used in my "Tactical tool tin" [an Altoids tin kit for survival kits and bug out bags] but I suspect many people will want to use this product as an EDC keychain tool.
There already is a pre-made, small (2.5 inch?) adjustable keychain wrench on the market but it is flimsy and has a very, very small nut range. It is more of a toy or a novelty if you ask me. My mod, on the other hand, is a REAL tool.
I don't own a grinder but people who do may consider changing the end of the tool into a pry bar/nail puller or some other tool they find useful! Remember: this is REALLY HARD METAL so only use tools made to attack that.