The manfrotto 468MGRC4 Hydrostatic Ball head model has similar features to
the standard range of ball and socket heads, with independent pan and tilt
locks, 360° pan and +90°/-90° tilt movement - but employs a revolutionary
friction and locking mechanism. An inner oil chamber is compressed by turning
the locking knob, exerting even pressure on the whole of the underside of the
ball, which ensures sturdier locking and higher Cap,acity.