Abstract: A wrench has an S-shaped body with a first end, a second end, a first slot, and a second slot. A virtual ground plane is substantially perpendicular to walls of the slots. A first virtual reference plane is perpendicular to the virtual ground plane and abuts the S-shaped body at first and second points on a first side. A second virtual reference plane is perpendicular to the first virtual reference plane and to the virtual ground plane and abuts the S-shaped body at a third point proximate the first end. A third virtual reference plane is perpendicular to the first virtual reference plane and to the virtual ground plane and abuts the S-shaped body at a fourth point proximate the second end. A fourth virtual reference plane is perpendicular to the virtual ground plane and abuts the S-shaped body at fifth and sixth points on a second side.