Manfrotto 468MG Hydrostatic Ball Head Accurate degree markings on rotation axes allow for precise positioning of the camera. A repositionable ratchet means that the locking lever's action will never be blocked either open or closed by interference with the camera body, tripod shoulder, etc. Sturdy all- metal construction. The double 90Degree groove (one on each side of the head) means switching from landscape to portrait is convenient however you're set up. Hydrostat ball locking system based on a chamber containing fluid, which, when pressurized by the tightening of the lock knob, exerts an even locking force on the ball for easy secure locking.