The PB336-18 Powerball head with 3 controls and quick release is the perfect ball head for cameras weighing up to 18lbs. This head features 3 separate controls - 360 degree pan, ball-friction and ball-locking for easy ultra-smooth positioning. The calibrated base and ball-friction control knob help give precision control when shooting panoramic scenes. An Arca-Swiss compatible quick release plate gives the ultimate in quick release systems and has a quick release safety lock for added security. The standard 3/8"-16 threaded base allows installation on most tripods. 2 bubble levels help keep things level for those perfect shots. Technical Specifications Ball: 36mm Capacity: 18lbs. Weight: 0.9lbs. Dual bubble levels Maximum Load: 18lbs