Review on DURATECH 11-Piece Metric Combination Wrench Set, 8Mm To 19Mm 12-Point CR-V Steel With Organized Holder by Pat Nard

Got these for a project I planned to do. Took out the wrench for the first bolt, and under a little pressure it just slipped off and started rounding the corners. huh. So I get out a socket and it has no problem doing the job. On to a different size. Same thing on a different bolt and size. It almost seems like the pattern is tapered, snug one direction and loose the other. Worthless. Funny because I have never had this issue with Harbor freight or other cheap wrenches. I don't usually return unsatisfactory items, but these can't go back fast enough. How do you screw up a wrench?