A wrench for engaging a workpiece comprises a pair of fixed jaws and a pair of movable jaws being movable relative to the pair of fixed jaws. The workpiece includes a plurality of flats which may be adjoined at a plurality of corners. The pairs of fixed and movable jaws may be configured to engage the workpiece in at least one of a flat engaging position and a corner engaging position. The flat engaging position comprises the pairs of fixed and movable jaws being engaged to one of the flats on each one of the opposing sides of the workpiece. The corner engaging position comprises the pairs of fixed and movable jaws being engaged to an adjacent pair of the flats on each one of the opposing sides of the workpiece.