To my eye, the top two reamers look to be jig bore reamers; I base this on the rather short overall length, and if you can confirm this, they do not have a chamfer on the cutting end; they are made to size holes that have been previously drilled, without pulling to the side if the drilled hole is not perfectly centered with the spindle axis, as opposed to a machine reamer, which pretty much follows the drilled hole; it makes a nicely sized hole but not necessarily located exactly at the axis of the spindle. Anyone who has used a machine reamer in the lathe on a hole where the drill may have started poorly and the hole runs eccentrically can witness this tendency; you end up with a hole that is not concentric with the part being made, and also, the hole is not so accuratly sized due to the reamer wobbling it's way along.
The bottom reamer looks to be an ordinary hand reamer, made to take only a few thousandths out of a hole that was likely bored or machine reamed.
