The RRS-9000439 Panning Clamp by Really Right Stuff delivers excellent horizontal panning as either a modular or built-in accessory. It utilizes RRS’s patented lever-release clamp jaw to quickly attach and detach rails and plates, and features a stainless steel lever that flips to 3 positions: closed, half-open, and fully open allowing you to see its position at a glance. The RRS-9000439 also features a lockable 360° panning bearing for convenient single-row panorama shooting. Other features include a built-in dovetail base, making it compatible with any Really Right Stuff Ballhead clamp and allows the ballhead itself to level the panning axis, removing the need for a leveling base. Really Right Stuff 72mm Round Lever-Release Clamp w/Panning Base RRS-9000439