A wrench assembly includes a plate that has a first side, a second side, a first end edge, a second end edge, a first side edge and a second side edge. The plate has an end opening therein extending into the first side and outwardly of the second side. The end opening is elongated and has a shape configured for engaging the wing head. The end opening is positioned nearer to the first end edge than the second end edge. A wing head, attached to a drain plug, may be engaged with and rotated by the plate.