With the Kirk SQRC-501PL Manfrotto Quick Release Clamp installing and removing your equipment from Manfrotto video heads is smooth and easy. This QR clamp features a full-size, sure-grip knob which provides you with smooth and easy control. The clamp rotates 90 and 180° for easy and quick positioning of your camera and it has a built-in bubble-level to keep a precise horizon. This clamp fits all Arca-style plates and mounts and its solid aircraft aluminum construction will provide you years of service.