Abstract: A tool for reshaping corner bead, which is perforated right angle metal strip used in fabrication of corners in drywall building construction, spreads the legs of 90 degree angle corner bead outwardly to increase the included angle thereof. The bead is rolled between a pressure roller and a multiplicity of idler rollers. The apex of the bead runs in a circumferential groove of the vertically adjustable pressure roller which presses downwardly as the legs ride upon idler rollers which resist the downward force while allowing sideward motion of the legs. Preferably, the rollers are comprised of mated pairs of hemispheres and the bead is made to pass through the tool by driving the pressure roller with a screw gun. The frame of the tool has a detachable tang which enables the tool to be mounted from the side wall pocket of a common pickup truck box.