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Like most Wera products, these are good quality tools. Colour coding isn't quite as useful as it is with screwdriver bits, but you do still get to know your commonly used keys. Makes grabbing the correct one just a little easier.
I've had my eye on these allen keys for quite a while but felt I couldn't justify the cost as my old unbranded allen keys worked well enough for what I needed. But I lost the old allen keys last week and so I decided to order the Wera set. What a difference! They just ooze quality and feel so much better in the hand than the old keys. The clip also works well - a nice, secure action to the lock and it's easy to extract individual keys as you need them. The colour-coding is very handy too.
The larger keys are quite a bit longer than the equivalents in my old set, but this helps with a bit of extra leverage so is a good thing. But I've attached a pic that shows the unlocked clasp against a tape measure so that you can see how long the keys actually are i.e. just in case you need more compact keys.