This is the guy I bought:
http://www.ebay.co.uk/itm/Franklin-Tools-7Pc-Hex-Key-Bit-Set-Hexagon-Allen-4380-/260830788441?pt=UK_Hand_Tools_Equipment&hash=item3cbab9fb59
Very good in my opinion if you need good drive, but less versatility. Great for crank bolts.
I'd be tempted to just DIY-colour-code with paint or Dymo labels.
@rodabod started
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This is the guy I bought:
http://www.ebay.co.uk/itm/Franklin-Tools-7Pc-Hex-Key-Bit-Set-Hexagon-Allen-4380-/260830788441?pt=UK_Hand_Tools_Equipment&hash=item3cbab9fb59
Very good in my opinion if you need good drive, but less versatility. Great for crank bolts.
I'd be tempted to just DIY-colour-code with paint or Dymo labels.