Abstract: A tool that can be held and operated with one hand to attach a corner bead to an outside corner of drywall includes a substantially V-shaped member having a pair of interior surfaces disposed at an angle of less than 100° and a frame or handle attached thereto. The handle maybe sized and shaped to fit comfortably in the palm of a human hand. A lever is pivotally attached to the handle. A pair of opposed pincers having pointed tips are pivotally mounted relative to the V-shaped member so as to allow the tips to move in a converging direction. A mechanical linkage system translates force applied to the lever into a the converging motion of the pincers.