Giottos MH621 Quick Release Ball Head MH7001-621 is a highly useful and versatile tripod accessory from Giottos. Attaching directly to the top of your tripod, the ball head is one of the most important components of any tripod, since it governs tilt, angle, rotation, and the mounting platform for your optical device. That's why Giottos has made this particular ballhead to an exacting standard, using lightweight but powerful materials and proven design techniques. The Giottos 7001 Ball Head with MH621 Quick Release gives you smooth panning with a stable base, and the ball head itself is extra large and hollow to reduce weight and facilitate motion. This Giottos tripod accessory features a Giottos MH621 Quick Release Adapter (with a short sliding plate) that allows you to swap out the digital camera on your tripod for another camera, a spotting scope, or another tripod-ready optical device. A tension knob gives you friction control for rotation, and the tripod accessory also features a locking knob to hold the ball in place. For a durable, smooth-action ball head for your tripod, mount the Giottos Sliding Plate Tripod Ballhead.