Well, I don't know what the real difference was, I just know I snapped several over a period of time with nothing more than a breaker bar or a long flex ratchet, mostly 1/2" drive 12 pts - no cheater pipes, no using a 1/4" drive when a 1/2" drive was needed, no chrome sockets on an impact wrench, etc. And I'm no "I'll be baaaack" Ahnold either.... Also warrantied a bunch with peeling/chipped chrome - some that hadn't done much more than rattle around in a tool tray. My father had 60's vintage Craftsmans that had seen far more use and were holding up just fine. These ones I bought new in the 80's may have been a bad batch, I don't know, but they were genuinely "Crapsmans" IMHO. Don't remember them looking that much different than my father's, except that the chrome was very bright compared to the much duller nickel-like chrome of his, if that makes sense.