http://www.amazon.com/dp/B000HGKR5K/?tag=atomicindus08-20 $23.88
looks similar to me? with the exception the HF set has 1 extra socket

I've found these type of sockets work good on a 1/2 drive impact with an extended shaft.
Using an extension cuts power probably around 50% so unless you have the correct impact your waisting your money.
similar yes, the same no. i see some very distinct differances.
illuminate us, they look identical to me.
Please explain how you came to that conclusion.
again, why?
again, why?
Because the extension acts like a torsion bar, a spring, as you will, and it absorbs energy when the impacts hit it. Thse short extension shown with those sockets won't absorb much, if any, energy. A long extension will eat it up. I have a 3' or so 3/8" drive extension that takes all the impact out of the input, I have to use a 1/2" impact with an adaptor or a breaker bar to break loose tight bell housing bolts when using it, the 3/8" impact just won't do it.
Sorry I guess I'm just in an argumentative sort of mood tonight 