I am looking for 4" cross slide vise and HF has two of those - regular one:
http://www.harborfreight.com/cpi/cta...Itemnumber=538
and one with "prismatic jaws":
http://www.harborfreight.com/cpi/cta...Itemnumber=106
could you please explain me the difference? I saw the first one on display (and
unfortunately it's out of stock - so I have to buy online) but not the second.

Thanks