Abstract: An open-end hand held ratchet wrench which has a rigid semi-circular jaw cradle defining an interior semi-circular channel which is substantially U-shaped in cross section. A handle extends off the opposite end of the cradle. Four radial recesses are arranged in spaced relationship in the bottom of the cradle channel and a gear is mounted in each one of these recesses for rotation on their respective gear axis. One or more ratchet pawls are also mounted in the cradle and positioned to prevent rotation of at least one of the gears in one direction. A cogwheel having a toothed outer perimeter is provided and dimensioned for meshing with the gears in the cradle channel and the cogwheel has a polygonal throughbore and a slot extending between the outer perimeter and the throughbore. The polygonal throughbore may be provided in different sizes to engage bolt heads or nuts of different sizes.