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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.
will never rust, as stainless steel, so could leave outside indefinately, extremely strong, A4 marine quality stainless steel,a quality set of allen keys not cheap at £30+ but if you want ultra high quality you have to pay for it, also, these keys do not turn on the corners, but on the flats so they will not round off the fastener or the allen key itself