I was surprised to see that they looked pretty crappy compared to the keys that came with my 1617EVS. The open end is a bit thinner and the overall forging quality is pretty poor. They're a little closer to the free wrenches you get with the tools you throw away than the set you'd pay $20 for. Can't comment on the hardness of the metal but if they start to warp like other reviews have said I'll get 16mm and 24mm open end wrenches somewhere and bend them myself for less money and better quality.
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