Allen Wrenches, Hex Key, Wrenches  - just do the math and you can add to a few more tools to your box.

If you have one set or several sets of wrenches... there always seems to be a time when you still don't have the correct size wrench. The alternative is to do the math and add up any combination of wrenches you have to get to the size you need. This will sharpen up your fractions skills if nothing else.

4mm + 4mm = 8mm Allen / Hex Head Bolt
3/16 + 3/16 = 3/8 Allen / Hex Head Bolt

Any combination will work, just be sure to take the time to correctly fit the wrenches square and tight inside the bolt, before applying any pressure.  Righty Tighty - Lefty Loosey

This method has worked for me more times than I can remember.  I've used 3 to 4 wrenches and found it to be a reliable and effective alternative to get me down the road.
Great idea. I will have to remember that. thanks
Exellent trick, thanks!! <br>
Hah! My uncle the diesel mechanics used to do this I I completely forgot about it until I saw this! Weird how memory works.
Good info, thanks for sharing it. Surely I will try it soon.
thanks for the tip, never knew about this.
Done this many a time - great trick when you've got stripped or abused bolt...
I've used hardened steel hex headed bolts with a pair of locknuts in the past to do this. Never thought about this method though. Nice tip, thanks for sharing.

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