The SE series comes in two different sizes.

Part number SE-1 uses standard type SF or SR drill bushings with a 1/2"O.D. X 1/2" long. Part number SE-2 uses 3/4" O.D. X 3/4" long bushings. Both pivot 180 degrees horizontally at the end, and can be locked in to any position. They both have three slots to increase clamping positioning, may also be clamped down with c-clamps. This is the bar of choice for many mechanics.
I guess you could say "It's the best, bar none".