  The full metric describing a stationary axisymmetric system of two arbitrary
Kerr sources, black holes or hyperextreme objects, located on the symmetry axis
and kept apart in equilibrium by a massless strut is presented in a concise
explicit form involving five physical parameters. The binary system composed of
a Schwarzschild black hole and a Kerr source is a special case not covered by
the general formulas, and we elaborate the metric for this physically
interesting configuration too.
