I suspect these:

http://www.amazon.com/exec/obidos/se...864969-7467329

Squanklin wrote:

Not sure of the name of it, but I borrowed one from a friend that was
fantastic. It has a flush, sliding clamp system built into it, so you
don't have to mess with C-clamps.

I've looked for one for myself, but it's not available at the big
shops. He says he got it at a retail woodworking supply store (I can't
find the name of the store or the product). They come in several
different lengths and are well worth the money in my opinion.