Giottos Series II Calibrated Tripod Ballheads are a set of versatile and durable tripod ballheads from the photography experts at Giottos. These Giottos tripod accessories provide you with everything you need to successfully mount and control your digital camera or camcorder from a steady shooting surface. Featuring dual pan and ball knobs, you can control every aspect of your tripod's angle and perspective from this ball head, right down to adjusting the friction around the socket ball using the ballhead's tension control knob. The Giottos Series II Ball Head features a hollow socket ball to improve the tripod accessory's weight and speed of movement; the hollow ball doesn't affect the ball head's toughness, however, as the largest models can hold 18 pounds of optical device weight. Giottos has equipped the top plate of the ball-head with dual threads, both a 1/4" thread and a 3/8" thread, ensuring that you can mount almost any digital camera or camcorder to your tripod. For a versatile, smoothly-moving ball head, screw on the Giottos Series II Dual Thread Ballhead.