Steel Ok - look, feel and processing fall through

Gained interest and curiosity this key sentence ordered and want to convince me of the quality itself.
For just over 30 euros not bad, for household use OK, not really suitable for hobbyists and aspiring professionals.

The steel itself may be OK, as far as one can judge without professional materials testing. The surface is very rough and porous.
The cheap production can be seen, unfortunately, surrounded by a sharp ridge on milled grooves and ridges in the mouth of the key.
Some key ring have thicker walls than others, especially in the small ring sizes the openings are off-center and the ring walls very thick.