I need to fabricate a hydraulic clamp for a pipe, and trying to find the
best way to grip onto a 2 7/8" pipe. I was looking at pipe jaws for a
vise but not sure if they would work that great. I was looking at the
below link for ease of fabrication and price because they have the thru
hole in them.

http://www.mile-x.com/wilton-2904200-pipe-jaws.aspx


Also looking at (what seems to be) bigger pipe jaws

http://www.mile-x.com/wilton-pipe-jaws.aspx

but they really don't give too much information on what they are or how
they work.

If anyone has any info or suggestions, I'd greatly appreciate it.

-Tom