My no-name cone wrenches have sloppier tolerances than better cone wrenches, but so far it hasn't been a problem because cones and locknuts don't involve too much torquing. The problem is with the same kit's no-name thin stamped metal wrenches intended for bottom brackets and other components where the sloppy tolerances can result in slippage and rounded off nuts or even bending the tools.

Ditto the advice to try a generic tool kit. I got a kit labeled Venzo VPT from Amazon a couplafew years ago and most of the tools have been very good. In particular the chain tool is so good it makes up for the less satisfactory bottom bracket tools. I've added a few better quality tools here and there but only after determining the kit tool wasn't quite stout enough, particularly for bottom brackets. Nashbar used to sell some pretty decent tool kits, but the Nashbar marque is in semi-limbo at the moment, no idea whether the new owner will stock the same tool kits.