Actually very good tool, but ...

We use this key now with us in a quite big company in the production and toolmaking. Namely, extremely often, because pretty much all screws are Allen screws. It is based on his experiences here even cheaper all, instead of simple keys, equipped with such keys because the screws consumption has dropped tremendously.

Basically, this is a hell of quality Imbusset, the color coding is actually a good thing (you can see with a little practice, its sizes but also without), and the Hex-Plus profile really super recommendable, because it screws very gentle (ideal for rare special screws) and also the keys to a longer service life helps. (The spherical head has a normal hexagonal profile.)

But in practice some problems but then available. In particular, the grip is suffering greatly but under the Kunstoffummantelung and the round shaft. Especially with oily fingers are the keys far more slippery than normal. Add to this the increased blade thickness. Although when new fit all the keys in the appropriate thread in stud screws, but if you must use a set screw by a designated hole in a cover times, there is in practice very often to problems. The hose cover is quickly unsightly and bruised, especially when extended to key times with a wrench or pipe or many deep recessed set screws has. Aggressive fluids may infiltrate the hose and cause corrosion and other chemicals transform the hose over time in a sticky bit. For use in very confined spaces you can not shorten it also.

Then there is the pretty as always missing 7er key (flathead screws standard size) and the high price. Due to the greater thickness of the parts do not fit into foreign stand / holder, so you can not mix sets in case some games is durchgenudelt.

Therefore I do not recommend these keys (although they really what hermachen)

As a practitioner I have definitely here to the favorable rates keys ie 9 9 BM N. Where the SM offer the Wera 950 PKL / SM N or 950 PKL / the better corrosion protection. Where the purchased 7er key then fits into the loop of the bracket - Perfect! These are therefore the key. which I bought for private vintage screws.
(Well, the lasered size designation, at least for the SM does not last forever, but who buys already key to read ...)