On Sat, 24 Aug 2013 01:51:40 -0400, "Lee Michaels"
It is a Mafell duo dowel system.
http://www.timberwolftools.com/tools/mafell/MAF-DD40P.html

One Mafell tool that really peaks my interests is their self
propelled track saw. It's been talked about here before, but I think
it deserves repeated mention. At $2500 it's not cheap, but there you
go.

http://www.youtube.com/watch?v=FvwrUMHu2oc