Giottos ARCA Tension Control Tripod Ballheads MH5501-657C are extra-fluid, smooth-panning, high-control ball heads for your Giottos tripod of choice. These well-engineered tripod accessories feature a heavily anodized aluminum ball that's hollow for a lighter weight and a smoother motion. Three control knobs - one for tension, one for the ball, and one for tripod pan - can lock the ballhead in place or instantly unlock it for quick adjustments. The calibrated base of the Giottos Series II ARCA Ball Head lets you position the tripod accurately every time, and the precise construction of the Giottos tripod accessory allows for an extremely smooth panning motion. Giottos has packaged these tripod ballheads with the Giottos MH657 Quick Release Plate, which features a 1/4" camera screw (compatible with most digital cameras), vertical retention strips that pop up when your camera is attached, and a red safety button that secures the quick release plate in place while you make adjustments. With a soft cork top and an adjustable-position camera screw, this quick release plate adds efficiency and versatility to the ballhead. For an efficient, smooth-rotating ball head that gives you the utmost of control over every aspect of your camera's angle, choose the Giottos ARCA Quick Release Ball-Head.