Abstract: A clamp assembly including a header assembly with first and second ends and a plunger having an aperture with a portion of the aperture being threaded, the aperture forming a portion of a bore extending through the header assembly. First and second arms, in opposing spaced relationship, are connected to the first and second ends, respectively, of the header assembly. A ram assembly having first and second ends, each end having a passageway through which at least a portion of one of the first and second arms extend. A stem assembly including an upper stem end coupled to a handle, a lower stem end rotatably connected to the ram assembly, and a threaded stem portion designed to engage the aperture threaded portion. The plunger has engaged and disengaged positions in which the aperture threaded portion and the threaded stem portion are threadedly engaged and disengaged, respectively, with each other.