In the latest countdown, Lesnar was shown using this piece of equipment that looked to be made of stainless steel, shaped like a long rectangle maybe 18 inches long. There were two handles that rotated within the rectangle. I've seen Anderson Silva also use this piece of equipment. I can't for the life of me figure out what it's called. Seems like such a newbie question, but it's been bugging the hell out of me. Does anyone know?