Saw a set today, looked unused. 8,10,12,13,14,15,17,18mm. 8 wrenches for $50. Any good? I would like a set of the ratcheting wrenches for disc brakes (mostly) but I am not sure if these are good or not. I could not tell if the open end was thin enough, which is desirable, although if a good deal I could just get a cheap 14/15mm and thin it a bit for the job.