The DE series comes in two different sizes. Part number DE-1 uses standard type SF or SR drill bushings with a 1/2" O.D. X 1/2" long. Part number DE-2 uses 3/4" O.D. X 3/4" long bushings. Both pivot 180 degrees horizontally in the middle, 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.