Besides single piece flow, it also shows leveled production, since it appears that there are two types of bars being fabricated and the process alternates between them.
As with any process, there's always room for improvement. Perhaps there is an opportunity to reduce the WIP between stations? How about holders for the pieces, so they don't roll around so much? Or moving that skid closer to the last operator so he doesn't feel the need to batch the parts when packing them on the skid? What do you see?