What is a bone rongeur ?

It's a strongly constructed instrument with a sharp-edged, scoop-shaped tip, used for gouging out bone, and a heavy-duty forceps for removing small pieces of bone.
Ruskin Rongeur is a double-action, plier handle, debulking instrument used to scoop away bone that may itself be in need of manipulation or may be blocking access to a surgical site. It is available straight or curved in multiple lengths with multiple bite sizes.